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Leica Definitions
 
   
 
   

Leica Definitions (a work in progress)

By: Thorsten Overgaard. February 2007. Last edit on May 25, 2018.

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This is the ongoing project of collecting the words used in photography and Leica.

 

 

35mm

a) 35mm lens is a lens that has a viewing angle of view is 63°vertically, 54° horizontally and 38° vertically within a 35mm film frame:
b) 35mm film format is a standard film format where the actual widt of the film is 35mm. In photography the frame within the widt of the film is 24mm (on the width) and 36mm (on the lenght of the film roll). 35mm was first used in 1892 by William Dickson and Thomas Edison for moving pictures with frames of 24 x 18mm, using film stock supplied by George Eastman (Kodak), and became the international standard for motion picture negative film in 1909 [later other formats came about such as Academy Ratio (22 x 16 mm), Widescreen (21.95 x 18.6 mm), Super 35 (24.89 x 18.66 mm) and Techiscope (22 x 9.47 mm)].
Oskar Barnack built his prototype Ur-Leica in 1913 as a device to test film stock and/or motion picture lenses and had it patented, but Ernst Leitz did not decide to produce it before 1924.
c) 35mm is often given as a comparison when talking about lenses in small cameras or cameras with other sensor/film format than the 24 x 36mm frame. The camera has a smaller sensor and hence uses a wider lens to capture the same image as a "35mm camera" would. Example: A camera with a 12 x 18 mm sensor has a 14mm lens on it, and even the lens is actually a 14mm, it is specified as a 28mm lens (35mm) which means that the resulting image is equivalent to a 28mm lens on a 35mm camera.

 

 
  The Leica 50mm APO-Summicron-M ASPH f/2.0 lens
   

50mm

a) 50mm lens is a lens that has a viewing angle of view is 47° vertically, 40° horizontally and 27° vertically within a 35mm film frame.
b) 50mm lens is often compared to the human eye. Not because of viewing angle but because of size ratio. The 50mm lens is the lens that comes closest to the size that the human eye see things (whereas the human eye has a much wider angle of view [120-200°] than the 50mm lens [47°], thought a more narrow focus (your eyes may observe very wide but your focus is on a limited view within that angle of view).

 

 

 

AEL = Auto Exposure Lock. This is a function that can be used when you want to reframe the scene, but keep the current exposure from changing.

AFL = Auto Focus Lock. This is a function that can be used when you want to reframe the scene, but keep the current focusing from changing.

AF = Auto Focus. The idea is that the camera does the focusing itself (the word auto comes from Greek "self").

AF Assist Lamp = The little red lamp on the front of the Leica CL, next to the red logo, will light up in dark places so as to help the Auto Focus to see in the dark. If you put a hand in front of the lens and press the shutter release button, you can see it in action. The AF assist lamp can be turned off in the menu.

anastigmat = an anastigmatic lens system.

anastigmatic (of a lens system) constructed so that the astigmatism of each element is canceled out.
ORIGIN late 19th cent.: from an- 1 [not] + astigmatic (see astigmatism):

astigmatism = a defect in the eye or in a lens caused by a deviation from spherical curvature, which results in distorted images, as light rays are prevented from meeting at a common focus.
DERIVATIVES astigmatic. ORIGIN mid 19th cent.: from a-- [without] + Greek stigma 'point' + -ism.

AOV - angle of view = Is the angle a lens 'see'. A 35mm lens has a 54° angle of view horizontally. Each human eye individually has anywhere from a 120-200° angle of viewn ags.

APO = stands for "apochromatically corrected". In most lenses, optical design concentrates the focus of blue light and green light into a single plane, but red light falls slightly into another plane of focus. Red subjects, therefore, would be ever so slightly out of focus compared to blue and green subjects in the same frame. Not sure you'd ever notice though, the difference is so slight. This is the same basic principle that requires you to shift the focus for infrared photography, related to the wave length of red light. In APO lenses, the design and expense has been put in to making red light focus on the same plane as blue and green. Under a microscope you would see that all light subject is now in focus, creating a sharper image overall. Many manufacturers offer APO designs, but in most of these only the very center of the lens is APO corrected. Leica prides itself on making most of the frame APO correct.
If one look at the images produced by the APO lenses (Leica 90mm APO-Summicron-M ASPH f/2.0, the Leica 50mm APO-Summicron-M ASPH, and the Leica 50mm Summilux-M ASPH f/1.4 that is in fact APO-corrected), one will notice that the colors are really bright and alive, almost more real than to the eye.
Apochromat; ORIGIN early 20th century, made of the two words;
apo: Greek origin, away from
chromatic (Latin origin, meaing relating to color.

 

 
 

 

 

Aperture = The f/ stop on the camera that regulates how much light passes through the lens. On a f/1.7 lens the lens is fully open" at f/1.7. At f/2.0 the aperture inside the lens make the hole through the lens smaller so only half the amount of light at f/1.7 passes through. For each f/-stop (4.0 - 5.6 - 8.0 - 11 - 16) you halve the light. The aperture of the lens is basically the focal length divided with the f/-stop = size of the hole (28mm divided with f/1.7 = the hole is 45 mm).
ORIGIN: Late Middle English : from Latin apertura, from apert- ‘opened,’ from aperire ‘to open’.

The aperture blades inside the lens is clearly visible in this photo by Eolake Stobblehouse.

 

 
  The camera in Aperture Priority Mode
   

Aperture Priority Mode. When the shutter speed dial on top of a Leica camera is set to A, it is short for “Aperture Priority” and allows the user to set a specific aperture value (f-number) while the camera selects a shutter speed to match it that will result in proper exposure based on the lighting conditions as measured by the camera's light meter. In other words, you set the aperture as priority (f/1.4 for example), and the camera calculates a shutter speed (1/250 of a second) that matches that. If you change the aperture to f/2.0 by changing the aperture ring on the lens, the camera will re-calculate the speed to 1/125 so as to get the same amount of light to hit the sensor (f/2.0 is half the light through the lens as f/1.4 and 1/125 if twice the amount of light on the sensor as 1/250).

 

ASPH = stands for "aspheric design". Most lenses have a spherical design - that is, the radius of curvature is constant. These are easy to manufacture by grinding while "spinning" the glass. This design however restricts the number of optical corrections that can be made to the design to render the most realistic image possible. ASPH lenses, however, involve usually 1 element that does *not* have a constant radius of curvature. These elements can be made by 1) expensive manual grinding, 2) molded plastic, or 3) Leica's patented "press" process, where the element is pressed into an aspherical ("non-spherical") shape. This design allows Leica to introduce corrections into compact lens designs that weren't possible before. Practically, the lens performs "better" (up to interpretation) due to increased correction of the image, in a package not significantly bigger than the spherical version.

There is another Aspherical lens manufacture technique: an uneven coating layer is applied to a spherical lens. The coating is thicker on the edges (or on the center, depending). Canon "Lens Work II" calls these "simulated" aspherical lenses. Simulated and Glass-Molded (GMo) asphericals show up in non-L Canon lenses, while the L lenses have actual ground aspheric elements.

Sphere: ORIGIN Middle English : from Old French espere, from late Latin sphera, earlier sphaera, from Greek sphaira "ball".

     
Normal spheric lens (grinded)   ASPH (note the shape of the glass as result of pressing rather than grinding)

 

Auto- means “self”. The idea is that when a camera has auto-(something), it does that (something) by itself.

Banding = Noise in digital images. Horizontal lines in a horizontal picture (if the camera is in portrait mode/vertical, the lines will obviously be vertical). It's simply noise; the result of uncontrolled algorithms working overtime with an image the sensor really can't see because it's very dark. (If your image has vertical lines in it, it is more likely that the sensor needs remapping).


This image at 6400 ISO, underexposed and then brought up to correct exposure in Lightroom, displays banding: Horizontal lines in the image. Leica M-D 262 with Leica 50mm APO-Summicron-M ASPH f/2.0.
This image at 6400 ISO, underexposed and then brought up to correct exposure in Lightroom, displays banding: Horizontal lines in the image. Leica M-D 262 with Leica 50mm APO-Summicron-M ASPH f/2.0.

 

Beam Splitter = Describes the way light travels when it enters the R series Leica SLR bodies when viewing and composing. The light beam is split into two - one part goes through the semi-silvered mirror to the light meter at the base of the mirror box, the rest is reflected upwards through the pentaprism to the viewfinder.
It is because of this "beam splitting" that you have to use Circular Polarizing filters on R cameras in order to obtain correct light meter readings. With regular linear pol. filters, phase cancellation effects occur when the light travels through the mirror, resulting in inaccurate and unpredictable readings.

 

  Barrie Gledden
  Bokeh of a Leica 50mm Noctilux-M ASPH f/0.95. British composer and producer Barrie Gledden.
© 2013 Thorsten Overgaard.

Bokeh = The visual quality of the out-of-focus areas of a photographic image, especially as rendered by a particular lens: It's a matter of taste and usually photographers discuss a 'nice' or 'pleasant' bokeh (the out-of-focus area is always unsharp, which is why the quality discussed is if one likes the way it renders or not by a particular lens). The closer you get to something, the 'more' bokeh' you get (in that the focus becomes less for the background and foreground at close distances than at long distances). ORIGIN from Japanese 'bo-ke' which mean 'fuzzines' or 'blur.'.

 

Bokeh: The visual quality of the out-of-focus areas of a photographic image. Photo at Bar del Fico in Rome. Leica TL2 with Leica 35mm Summilux-TL ASPH f/1.4. © 2017 Thorsten Overgaard.Bokeh: The visual quality of the out-of-focus areas of a photographic image. Photo at Bar del Fico in Rome. Leica TL2 with Leica 35mm Summilux-TL ASPH f/1.4. © 2017 Thorsten Overgaard.

 

C = Continuous shooting. When the ring by the Shutter Release on top of the camera (or in the menu of digital cameras that doesn't have such a feature on the outide of the camera) is moved from OFF to C, the camera takes series of images as long as the shutter release is pressed down. In some cameras the speed of continious shooting can be adjusted. For exampel in the Leica Q under the menu point Continuous Shooting you can define if the Continuous should be Low (3 fps), Medium (5 fps) or High (19 fps).

Camera - is today’s short name for Camera Obscura (meaning “a dark room”). Camera means Chambre and was used only as a Latin or alien word, actually only for Spanish soldiers’ rooms, until popularized in connection with photography in 1727: “Camera Obscura”. In 1793 the slang term “camera” was used by Sterne Tr. Shandy: “Will make drawings of you in the camera” and by Foster (1878), “The eye is a camera”. Camera Obscura was described by Iraqi scientist Ibn-al-Haytham in his book, “Book of Optics” (1021) and by Leonardo da Vinci in 1500; popularized and made widely known in 1589 by Baptista Porta when he mentioned the principle in his book “Natural Magic”. Johannes Kepler mentions Camera Obscura in 1604.
Camera = chambre (room), Obscura = dark (or cover).

CCD sensor (as used in Leica M8, M9, Leica S) = (Charged Coupling Devices) - The first digital cameras used CCD to turn images from analog light signals into digital pixels. They're made through a special manufacturing process that allows the conversion to take place in the chip without distortion. This creates high quality sensors that produce excellent images. But, because they require special manufacturing, they are more expensive than their newer CMOS counter parts.

Central Shutter = Some lenses, for example the Leica S lenses and the Leica Q where a shutter is located in the lens itself. In most cameras there is a shutter curtain just in front of the sensor, and in SLR (Single Lens Reflex) cameras there is also a mirror in front of the shutter curtain.
In the Leica T/TL/TL2 the shutter is in front of the sensor, but only acts to "refresh" the sensor. In the Leica TL2, there is a mechanical shutter curtain from 30 sec. to 1/4000 shutter times, and digital shutter from 1/4100 to 1/40,000 shutter times. A digital shutter is simply "turning on/off the recording of the sensor.

CL = Compact L(eica). Used to be the name of the Leica CL "Mini M" that Leica Camera AG and Minolta made together in the 1980's. The name was used again in 2017 for the digital Leica CL.

The Leica CL 35mm film camera was made as Leica CL and Minolta CL and shared technology. It also introduced three CL lenses together with it, as a compact and economical alternative to the Leica M camera.
The Leica CL 35mm film camera was made as Leica CL and Minolta CL and shared technology. It also introduced three CL lenses together with it, as a compact and economical alternative to the Leica M camera. See more on the original Leica CL here.


The digital Leica CL with 18mm Elmarit-TL f/2.8. © 2018 Thorsten von Overgaard.

 

CLA
An acronym for "(C)lean, (L)ubricate & (A)djust", whereby the item is merely re-lubricated, fine-adjusted and calibrated rather than repaired. "I just got my equipment back from CLA at Leica"

CMOS sensor (as used in Leica CL, Leica T/TL/TL2, Leica M 240, Leica M Monochrom Typ 246, Leica S Typ 007, Leica SL, Leica Q, Leica M10, Leica X, Leica D-Lux, etc.) = (Complimentary Metal Oxide Semiconductor) chips use transistors at each pixel to move the charge through traditional wires. This offers flexibility because each pixel is treated individually. Traditional manufacturing processes are used to make CMOS. It's the same as creating microchips. Because they're easier to produce, CMOS sensors are cheaper than CCD sensors. CMOS allow Live View and use less energy than CCD.

Compur
Leica I Compur camera (1926-1941) and Leitz Compur 50mm f/3.5 (1938) and Leica Summicron (II) Compur 50mm f2.0 lens (1959).


Leitz Compur B camera.
Leitz Compur (Model B) camera designed by Oskar Barnack, lens designed by Oskar Barnack, with the Compur leaf shutte from Bruns & Deckel in Munich. (Size L x H x W - 133 x 65 x 30 mm / 5.24 x 2.60 x 1.54 in). Approx 1651 of these were made from 1926-1941.

Contrast - The degree of difference between tones in a picture. Latin contra- ‘against’ + stare ‘stand.’

CS = Central Shutter = As in the Leica S lenses for the Leica S where a shutter is located in the lens itself. In most cameras there is a shutter curtain just in front of the sensor, and in SLR (Single Lens Reflex) cameras there is also a mirror in front of the shutter curtain.
In the Leica Q and Leica Digilux 2 the shutter is in the lens which makes the camera mirrorless as well as very quiet because there is not a metal shutter curtain going up and down in front of the sensor.

Depth - Distance between front and back. Distance from viewer and object.

 

Digital Shutter = A digital shutter is simply "turning on/off the recording of the sensor. In the "old days" this had to be done with an actual mechanical shutter curtain; a metal curtain in front of the sensor (or film) that goes up for 1/125th of a second, for example. In the Leica TL2, there is a mechanical shutter curtain from 30 sec. to 1/4000 shutter times, and digital shutter from 1/4100 to 1/40,000 shutter times.

Digital Zoom = Refers to zooming in on a scene digitally. All that happens is that the camera zooms into the area of the sensor and records only that. The quality will be less as it's a smaller part of the same recording. Zoom is originally used for an optical zoom lens where optics move inside the lens so as to enlarge the subject optically. This does not reduce the image quality/resolution the same way as digital zoom does. Generally, digital zoom can be performed on any picture later in the computer as it's in essence simply a crop.
In the Leica Q Digital Zoom refers to the possibility to change the crop from 28mm to 35mm or 50mm. Choosing a different "digital zoom" simply shows frame lines for the chosen focal length in the EVF and in the final image (that is in fact the full 28mm frame), there is a pre-selected crop for the chosen frame when you open the image in Lightroom 6.

Digital zoom is in essence a crop of the image to make the scene appear closer. © 2017 Thorsten Overgaard.
Digital zoom is in essence a crop of the image to make the scene appear closer. © 2017 Thorsten Overgaard.

 

DIS = Digital Image Stabilization. This is a feature often offered in video recorders and sometimes for tele lens still photography (so as to avoid motion blur when the lens is moving during slow shutter speeds)
For example the Leica Q offers DIS but the factory recommend to set it to OFF. (The DIS is set to off from the factory because it can affect the image quality negatively, according to product director Stefan Daniel in an interview).

 
  Lens distortion looks like this. The lines are not straight. Our eye uses distortion correction. Lens designers can design lenses so they have very little distortion, or they can make less complicated lens designs and "fix" the distortion in software.
   

Distortion = In photo optics/lenses: When straight lines in a scene don't remain straight because of optical aberration.

Lens designers can correct for distortion to a degree so the whole image field is perfect corrected and all lines remain straight. In modern lens design many designs rely on Software Distortion Correction (SDC).

The eye adjusts for distortion so we always see vertical and horizontal lines straight when we look at things. Even when you get new prescription glasses (if you use such), you will often experience distortion in your new glasses. After a few days they eyes have adjusted for the glasses and the distortion you saw to begin with is now gone. Software Distortion Correction (SDC) is far behind what the human eye can perform of adjustments. (Also see my definition on Perspective for more on the eye and optics)

 

DNG = Digital Negative, an open standard developed by Adobe. It is a single file that contains the raw image data from the sensor of the camera as well as date, time, GPS, focal length, settings, etc.
The alternative is a RAW file + XLM file where the RAW file contains the image information and the XML contains the rest of information about where, how and when the picture was taken.
A Camera Raw profile (that is specific for that camera) in the computer helps the software program, for example Adobe Lightroom, to translate the RAW data into the image.

A raw file (or DNG) is simply the full recording of digital data (1's and 0's) from the sensor. In the computer, the sensor data is translated into the exact colors, via a camera profile.
A raw file (or DNG) is simply the full recording of digital data (1's and 0's) from the sensor. In the computer, the sensor data is translated into the exact colors, via a camera profile.

 

  DOF scale ont the Leica Q lens
  DOF scale ont the Leica Q lens
   

DOF = Depth of Field. This is how much of the image will be in focus or "acceptable sharp". The DOF is determined by the subject distance (the farther away, the larger area is sharp; the closer the focus is, the less of the lage is sharp), the lens aperture (the depth of field is narrow at f/1.4 and larger at f/5.6) and the focal length of the lens (tele lenses has very narrow depth of field whereas wide angle lenses has a wide depth of field) and film or sensor size (small-sensor cameras has a wide depth of field wheras medium format or large format cameras has a very narrow depth of field). As an example, a Leica 21mm Super-Angulon-M f/3.4 lens is sharp all over the focus field from 2 meter to infinity when set at a distance of 3 meters at f/3.4. The DOF scale measurement on top of the Leica lenses shows lines for each f-stop that indicates from which distance to which distance the image will be sharp. Shallow DOF is a generally used term in photography that refer to lenses with very narrow focus tolerance (which can be used to do selective focus; making irrelevant subjects in the foreground and background blurry so only the subjects of essence are in focus and catches the viewers eye).


Depth Of Field scale from Fujifilm.


 

Leitz Summicron DR f/2.0 (order no SOOIC-MN). There also exist a lens shade that is not shown in this picure.

 

DR = Dual Range lens. This is a type of Leitz/Leica lens that works as macro (near focus range) and normal lens, and comes with googles/"Eyes" for the macro function. The 50/2 Dual Range Summicron was made from 1956 to 1968, only in chrome, with a near-focusing range as close to 478mm.

You mount the googles/"Eyes" to focus at close range. If you use the lens in normal range, you can take off the googles/"Eyes"

The googles/"Eyes" can be critical for which camera the lens fits on. the Leica M6 TTL requires that the plastic tab onthe eyes is removed; and other Leica M models likewise. It fits on the Leica MP, M2, M3 and oterh models. .


Leica M2 with Dual Range Summicron-M f2.0. © Dave Dunne.
Leica M2 with Dual Range Summicron-M f2.0. © Dave Dunne.

 

Leitz in Canada
Ernst Leitz Canada (ELCAN)
was established in 1952 close to Toronto in Canada.

 

Dynamic range. The grade of ‘contrast range’ (or number of tones) a film or sensor, or simply a photograph, possess between bright and dark tones. The human eye is said to have a dynamic range of 10-14 ‘stops’ (but because we scan area by area and compile a concept of the overall scene, they eye is often thought to have a much higher dynamic range), Film used to have 7-13 ‘stops’ and some modern sensors have up to 15-17 ‘stops’.

ELCAN - Ernst Leitz Canada, established 1952, was the Leitz family's guarantee against another war in Europe and/or invasion from Russia after WWII. Besides becoming a copy of the Wetzlar factory, it also became the somewhat military/industrial branch of Ernst Leitz . Because of the precision work, high standards and knowledge in optics for science and millietary, the ELCAN plant was sold to Raytheon (USA), who bought it from its previous owner, Hughes Aircraft Co.

Elcan-R is also the name of s series of lenses made in the 1960ies and early 1970ies, as the U.S. Navy High Resolution Small Format Camera System during the Vietnam war.

 

Ad for ELDIA slide copier.

ELDIA
Leitz slide copier used to dublicate slides if one for example had to make several sets of a slideshow.

 


ELDUR Slide Printer

ELDUR
Leitz slide copier used to dublicate slides if one for example had to make several sets of a slideshow.

 

Elmar
Refers to the maximum lens aperture - here f3.5 . Historically derived from the original 1925 50mm f3.5 Elmax lens, which was an acronym of (E)rnst (L)ieca and Professor (Max) Berek, designer of the original lenses. Later that year the 50mm f3.5 Elmar superceded the Elmax, which was discontinued due to its complexity and high cost of manufacture.

Elmarit = Refers to the maximum lens aperture - here f2.8 . The name is obviously derived from the earlier (and slower) "Elmar" designation. Not every f/2.8 lens is called an "Elmarit" though, the most obvious current exception being the 50mm f2.8 Elmar-M collapsible lens which for nostalgia and marketing reasons has kept the original 1930's Elmar name (the 50mm f3.5 collapsible Elmar, manufactured 1930-59, was one of Leica's most famous and popular lenses). Vario-Elmarit (and Vario-Summicron, etc) is Leica Camera AG's name for zoom lenses.

Elmax
Elmax lens named after = Ernst Leitz + Max Berak. Ernst Leitz was the founder of Ernst Leitz Optical Industry which later became Leica. Professor Dr. Max Berak was employed at Leica in 1912 and was the architech of the first Leica lens which Ernst Leitz asked him to design for the "Barnack's camera" (the 1913-prototype named after Oscar Barnack who invented it). The lens was a f/3.5 50mm and was known as the Leitz Anstigmat and later the Elmax.

 

Elmax (Ernst Leitz Max Berek) by Marco Cavina 2010
The Leitz Elmax 50mm f/3,5 (1925-1961) on the Leica A camera (1925) camera. Photo by Marco Cavina.

 

EVF = Electronic ViewFinder. A viewfinder where you look at a small screen through optics/prisms. The advantage is that you see what the sensor sees.


The EVF (Electronic Viewfinder) on the Leica SL 601.
The EVF (Electronic Viewfinder) on the Leica SL 601.

 

Exposure Bracketing = The possibility to set the camera to automatically record a series of images where the exposure is above and below what the camera measures. The idea is that at least one of the images will be correctly exposed.

 

f/ (f-stop, also knwn as aperture).

f- (focal length).

f/1.25 is the size of the "hole through" the lens, the aperture. f/1.25 means focal length divided with 1.25. In the Leica 75mm NoctiluxM ASPH f/1.25, the "hole through" the lens at f/1.25 is 60mm in diameter. At f/1.4 the "the hole through" is 53.5mm in diameter. At f/4 the "hole through" is 18.75mm in diameter.
Each step smaller from f/1.4 to f/2.0 to f/2.8 to f/4.0 and son on is a reduction ofthe light to half for each step. The Noctilux f/1.25 therefore lets 50% more light in through the lens than a 75/1.4 Summilux.


f-stop = the ratio of the focal length (for example 50mm) of a camera lens to the diameter of the aperture being used for a particular shot. (E.g., f/8, indicating that the focal length is eight times the diameter of the aperture hole: 50mm/8 = 6,25 mm); or the other way around, the hole is the focal length divided with 8).
ORIGIN early 20th cent.: from f (denoting the focal length) and number.
One f-stop is a doubling or halving of the light going through the lens to the film, by adjusting the aperture riing. Adjusting the f-setting from f 1.4 to f.2.0 is halving the light that goes through the lens. Most Leica lenses has half f-stops to enable the photographer to adjust the light more precicely.


The aperture blades inside the lens is clearly visible in this photo by Eolake Stobblehouse.

 

Flare = Burst of light. Internal reflections between (and within) lens elements inside a lens. Mostly, flare has a characteristic "space travel" look to it, making it cool. Particularly in older lenses with less or no coating of the glass surfaces to suppress this, it can be a really cool effect. In newer lens designs, the coatings and overall design try to suppress flare and any reflections to a degree, so that there is seldom any flare to be picked up (moving the lens to pick up a strong sunbeam), but instead a "milking out" (or "ghosting") of a circular area of the frame; meaning simply overexposed without any flare-looking flares.

 

Sunlight creating flare in the bottom right quadrant of the image.

  The camera moved slightly to avoid the flare.
     

 

Fn = Short for Function. It's a button or wheel you can program.

The Leica TL2 and Leica CL has two Fn wheels (wheels you can program to different functions after your likings).
The Leica TL2 and Leica CL has two Fn wheels (wheels you can program to different functions after your likings).

 
  A 28 mm lens has a 74° viewing angle
   

Focal length = Originally focal length referred to the distance from the sensor (or film in older days) to the center of focus inside the lens (28mm, 50mm, 400mm, etc). Today one call it effective focal length (EFL) as a 400mm lens is not nessesarily 400mm long due to optical constructions that can make it shorter. The 35-420mm zoom on the Leica V-Lux 1 is for example only ca. 135 mm long. Nobody uses that measurement, except those who construct lenses! For users of lenses, focal length refers to how wide the lens sees. The viewing angle, which is often given in for example 90° viewing angle for a 21mm lens, 74° viewing angle for a 28mm lens, 6° viewing angle for a 400mm lens, etc.
Each human eye individually has anywhere from a 120° to 200° angle of view, but focus only in the center.

Focus, in - Sharp and clear in appearance. Focus - “The burning point (of a lens or mirror)”. In Latin the word focus meant fireplace or hearth. The word was probably first employed outside of its Latin literal use as “the burning point of a lens or mirror” in optics, and then came to mean any central point. The German astronomer Johannes Kepler first recorded the word in this sense in 1604.

Four Thirds - Also known as "4/3" - The Four Thirds System is a standard created by Olympus and Kodak for digital SLR camera design and development.
The system provides a standard which, with digital cameras and lenses available from multiple manufacturers, allows for the interchange of lenses and bodies from different manufacturers. Companies developing 4:3 cameras and/or lenses are Fuji, Kodak, Leica, Olympus, Panasonic, Sanyo, Sigma. See www.4-3system.com
A further development in this was Micro Four Thirds Systems.

 
  Full Frame is "king of photography"
   

Full Frame (FF) = The size of the sensor is 24 x 36mm which is the format Oskar Barnack and Leica Camera AG invented with the first Leica that was introduced in 1925. Many other formats invented since, such as APS, APS-C and all usually refer to Full Frame ratio, by which it means what size they have compared to Full Frame. The "full frame" technically deifinition thouhg is a sensor that camtures the full frame in one go (as the early sensors as in Leica S1 scanned the image/senor over a period of time).
The 24 x 36mm Full Frame format is so "king of photography" that it has continued to be the ideal for all cameras. Besides this, there exists Large Format cameras such as 4x5" (100 x 125 mm) and Medium Format 6x6 (60 x 60mm amongst other sizes in that area).

 

Ghosting = Secondary light or image from internal reflections between (and within) lens elements inside a lens. The reflected light may not always be in focus, so overall it looks like a "milked out" image. A subject in focus has brightened patches in front of it that come from reflections inside the lens. the most elementary look of ghosting is when you look in a rear-view mirror in a car at night and you see doubles of the headlights behind you (a strong one and a weaker one), because the headlights are reflected in a layer of clear glass on top of the mirror glass.

   
Degrees of ghosting from strong sunlight entering from outside the frame. To the right the outside light has been shielded with a shade.

 

 

  The Hektor 73mm f/1.9 of 1930-1931 sells at $900 - $6,000 these days.
  The Hektor 73mm f/1.9 of 1930-1931 sells at $900 - $6,000 these days.
   

Hektor - Refers to the maximum lens aperture - usually f2.5 (whihc at the time of development in the 1930's was considered very light-strong lenses). The name was apparently taken from the name of lens designer, Professor Max Berek's dog, Hektor. He also had another favorite dog, Rex, which may have inspired the lens name Summarex.
But ... there is also another possibility, which is that Hektor (the lens and/or the dog) was inspired by Hektor, the oldest son of the Trojan king Priamos, who is listed in the history books as being the most couragerous defender of his home city, Troy. (Max Berek knew of this because Greek history had been required during his high school education).
In any case, the first 50mm Hektor f/2.5 was designed by Max Berek in 1931 for the Leica I Model A, and the - for that time - extremely light-strong 73mm Hektor f/1.9 was designed in 1930-1931 in preparation of the modular Leica system.

 

Hue = A color or shade depending on the dominant wavelength of red, green or blue. The word Hue comes from Swedish hy which is "skin complexion". It is independent of intensity, so often (in computer editing programs for example), Hue is an adjustment along Saturation which is (intensity of color as compared to white)

 

ISO = Light sensitivity of the camera sensor is given in ISO (International Organization for Standardization). It's a standard that was used in film and is now used in all digital cameras also. The base ISO for the Leica TL2 sensor is around 100-150 which means that this is what the sensor "sees". All other levels are computer algorithms calculating the effect as if the sensor could "see" more (hence noise at higher ISO levels).
ISO goes in steps of doubling: When the ISO is raised from 100 ISO to 200 ISO, the camera only need half the amount of light to make the same picture. For each step in ISO to 400, 800, 1600, 3200, etc. the light sensitivity is doubled for the sensor (and the camera sensor only need half the light of the previous ISO to record the same image).

6400 ISO photo from Hollywood at night. Leica TL2 with Leica 35mm Summilux-TL ASPH f/1.4. © 2017 Thorsten Overgaard.
6400 ISO photo from Hollywood at night. Leica TL2 with Leica 35mm Summilux-TL ASPH f/1.4. © 2017 Thorsten Overgaard.

 

JPEG = A standard for picture format made in the 1990's by Joint Photographic Experts Group). Mostly referred to as JPG as in L1003455.JPG which would be the name for a JPG file from the camera.

 

Kyocera
Sub-manufacturer of lenses. Has made certain lenses for Leitz, Carl Zeiss, etc.

 

Lantern slide (later known as a slide film, a transparency or a dia-positive). A transparent film or glass plate in positive, and mostly in color, that can be projected onto a wall or screen in large size by putting the slide into a slide projector ("magic lantern" as they were called back in the day) that sends light through the film and projects it to a wall or screen via a lens.

Lantern slide from early 1900's by Ada Hayden.
Lantern slide from early 1900's by Ada Hayden. (Later known as a slide film, a transparency or a dia-positive).

 

Lantern slideshow in 1897.
Lantern slideshow in 1897.

 

 

  LCos display
  LCoS display
   

LCOS (viewfinder screen in the Leica Q) = Liquid crystal on silicon is a high-quality method for near-eye displays, better than LCD (Liquid-crystal display). There are two broad categories of LCoS displays: Three-panel and single-panel. In three-panel designs, there is one display chip per color, and the images are combined optically. In single-panel designs, one display chip shows the red, green, and blue components in succession with the observer's eyes relied upon to combine the color stream.

 

Leica = A compound word derived from " (Lei)tz" and "(ca)mera". Apparently they were originally going to use "LECA", but another camera company already used a similar name in France, so they inserted the 'i' to prevent any confusion.

Lens - A piece of glass or similarly transparent material (like water or plastic). It has a shape so that it can direct light rays. The word “Lens” is used both for single piece of glass as well as a camera lens with several lenses that works together. From ‘lentil’ because similar in shape.

Lens hood = A tube or ring attached to the front of a camera lens to prevent unwanted light from reaching the lens and sensor. ORIGIN Old English hod; related to Dutch hoed, German Hut 'hat,' also to hat.

 

Level Gauge = This is a tool in the viewfinder to see if you hold the camera 100% horizontal and/or vertical. You can turn it on in the Menu > Photo Live View Setup > Level Gauge > On.

Light = Tiny particles called photons that behaves like both waves and particles. Light makes objects visible by reflecting off of them, and in photography that reflecting off of subjects is what creates textures, shapes, colors and luminance. Light in its natural form (emanating from the sun) also gives life to plants and living things, and makes (most) people happier. So far, nobody has been able to determine exactly what light is. The word photography means “writing with light” (photo = light, -graphy = writing). Read more about light in my book Finding the Magic of Light.

Live View = This is the ability to see the image the sensor see, live, via the screen, or via an electronic viewfinder (EVF).

 

M
(as in "M3", "M6", "M7" etc.)
A) The M originally stands for "Messsucher", which is German "Meßsucher" for "Rangefinder". The "3" in M3 was chosen because of the three bright line finders for the 50, 90 and 135 mm lenses. Later the numbers of the M cameras were more or less chosen to follow each other.
M-body evolution in chronologic order:
M3 - MP - M2 - M1 - MD - MDA - M4 - M5 - CL - MD-2 - M4-2 - M4-P - M6 - M6 TTL - M7 - MP - M8 - M8.2 - M9 - M9-P - MM - ME (Type 220) - Leica M (Type 240) - Mini-M
B) M also refer to M-mount as the M bayonet that couple the Leica M lenses to the Leica M camera. Before the M bayonet the coupling between the camera and lens was screwmount.
C) M nowadays refer to the Leica M line of cameras rather than the "Messucher".

M9
Leica M9 is a model name for the Leica M9 that was introduced on September 9, 2009 (as the first full-frame digital Leica M). It was the latest model designation using the M and a number. From their next model, Leica Camera AG introduced a new model system so each camera would simply be a Leica M but then with a model designation like Typ 240, Typ 246, Typ M-D 262 and so on. The idea was inspired from Apple who name their computers for example MacBook Pro and then it has a sub- model number designation which model it is (and which would define speed of processor, etc).



Leica M9

 

MACRO = Macro lens. The Leica 60mm APO-Elmarit-Macro-R ASPH f/2.8 is a 60mm lens for portraits, landscapes, etc. as well as a near focus macro lens. The Leica Q lens can be turned to Macro which enables you to go close so as to enlarge smaller subjects. The Leica M cameras becomes Macro when you add a Macro ring "Oufro" or "Leica Macro M Adapter" that increases the lens' distance to the sensor. The word macro comes from Greek makros ‘long, large.’

 

The word macro comes from Greek makros ‘long, large.’ The Leica 60mm APO-Elmarit-Macro ASPH f/2.9 is both a 60mm lens for portraits, landscapes, etc as well as a near focus macro. © Thorsten Overgaard.
The word macro comes from Greek makros ‘long, large.’ The Leica 60mm APO-Elmarit-Macro ASPH f/2.8 is both a 60mm lens for portraits, landscapes, etc. as well as a near focus macro. © Thorsten Overgaard.

 

Maestro II - A processor developed first as Maestro for the Leica S2 and upgraded to Maestro II for the Leica S (Typ 007). The Leica Q has a Mestro II (Leica Q edition) processor developed by SocioNext Inc. based on Fujitsu's Mibeault architecture. Leica M10 also has a Maestro II processor, but seemingly developed further for this model.

 

Magic Lantern - Later known as a slide projector. Leica came out with their first projectors in the 1930's (see a list of projectors and acessories here). It's a device with a strong lamp behind a transparent picture (slide) that is projected to a wall or screen via a lens. Today we use LCD projectors which is simply a digital image on a small screen inside the projector house that is projected to a wall or screen by a lens. Early models of LCD projectors had three lenses so as to projet each channel of red, green and blue onto the wall or screen.

 

 

Mandler, Dr. Walter (1922 - 2005)
Legendary Leica lens designer and CEO of Ernst Leitz Canada (ELCAN) 1952-1985. Read more in Leica History.

 

Meßsucher
(rangefinder or distance finder) = Mess = range, sucher = finder. It is always correctly written with the "ß". There are technically not three "s", rather the "ß" and one "s" because it is a word constructed by the combining of two precise words.

 

MF (Medium Format), as in the Leica S System

mm = millimeter(s), as in a 50mm lens. (Earlier in lens history lenses focal length was given in cm = centimeters; as in a 5 cm lens). For anyone used to centimeters and millimeters, it’s no wonder. But if you grew up with inches, feet and yards, you may have had a hard time grasping what a 50mm lens was. But as lenses were designed first in Europe, the metric system with centimeters and millimeters was used to describe lenses.
The reason a 50mm lens is a 50mm lens is that there is 50mm from the focus plane (the film or sensor) to the center of focus inside the lens. When photography was a young subject, it was engineers who made it all, and the users were expected to understand. The engineers were so into the making of the lenses, that it apparently never dawned upon them that today’s users would think of a 21mm lens as a wide angle lens rather than a lens where there is 21mm from the sensor to the center of focus inside the optics.

MP
Stands (also) for Mechanical Perfection.

ND
Neutral Density filters are grey filters function as 'sunglasses' for lenses. They simply block the light so that a lens can work at for example f/0.95 or f/2.0 in sunshine.
If a camera is set to 200 ISO and the maximum shutter speed is 1/4.000, this will usually result that the lens has to be at f/2.8 or smaller aperture in sunshine. Else the image will over-exposed. So in order til stay within the maximum shutter speed of 1/4.000 and still use a lightstrong lens wide open, one mount a ND-filter that reduce the light with 3 stops (8X) or 6 stops (64x).
For video ND-filters are used quite a lot (as the shutter speed for video is 1/60), and ND-filters are also used to reduce the light for really long multi-exposures at night (stop-motion video and stills).
ND-filters also exist as variable ND-filters so one can adjust the amount of light going through from for example 1 stop (2X) to 6 stops (64X).
ND-filters also exist as graduated ND-filters where the top of the filter is dark and then gradually tone over in no filter (so as to reduce the skylight in a landscape for example).
The ND filters are called Neutral because it is a neutral filter. It doesn't change colors, only the amount of light.

ND-Filrers. Neutral Density. Photo © Thorsten Overgaard
ND-filters / gray-filters.

 

"Niner"
The nick-name for the 90mm f/2.5 Leica lens in the 30s when it first came out.

Noctilux = Also known as "King of the Night" because "Nocti" means Night and "Lux" means Light. The f/1.0 lenes from Leica are named "Noctilux". The first Leica Noctilux lens was the 50mm Noctilux f/1.2 which shortly after it's introduction was improved to the 50mm Noctilux f/1.0. In the current model the f-stop has been improved further to f/0.95.
"Noctilux" refers to the maximum lens aperture - here f1.0 . "Nocti" for nocturnal (occurring or happening at night; ORIGIN late 15th cent.: from late Latin nocturnalis, from Latin nocturnus ‘of the night,’ from nox, noct- ‘night.), "lux" for light. The Leica Noctilux 50mm f1.0 is famous for enabling the photographer to take photos even there is only candleligts to lit the scene. See the article "Noctilux - King of the Night"

The Noctilux "King of the Night" lens. From left the 0.95 in silver (same on the camera, in black, the f/1.0 in the back and the rare and expensive first model, the f/1.2 in the front.
The Noctilux "King of the Night" lens. From left the f/0.95 in silver (same on the camera, in black), the f/1.0 in the back and the rare and expensive first model, the f/1.2 in the front.

No.
Number, on this site Leica catalog numbers or order numbers. Some the numbers changed depending on the number of cams in the lens: The Elmarit-R f2.8/135mm started life as No. 11 111, however when fitted with 2 cams for the SL became No. 11 211, yet another No. for the 3 cams lens and a fourth number for 3 cam only at the end of its life. Number changes also applied to M lenses depending on whether they were screw-thread, bayonet or for M3 with “spectacles”. Thus the No. in the Thorsten Overgaard Leica Lens Compendium list is a guideline but not a comlete list of existing catalog numbers.

OIS = Optical Image Stabilization. This is used in tele lenses where blurring motion of the camera from inevitable vibrations are adjusted by the lens. At low shutter speeds and/or with long lenses, any slight movement would result in a picture with "motion blur" unsharpness. The Leica TL2 supports optical image stabilization when A) OIS is turned on in the camera menu, and B) when you use lenses with OIS (the Leica SL longer lenses has OIS). An alternative is EIS = Electronic Image Stabilization, which the Leica T has. Here the problem of "motion blur" is corrected electronically after, which might lead to image degradation. However, the larger the sensor resolution, the less one will notice small 'degradation'.

Optic = Eye or vision. From French optique or medieval Latin opticus, from Greek optikos, from optos ‘seen.’

 

 

  Visoflex II /Visoflex III adapter (produced 1959-1983 as part no. 16466
   

Oubio
Visoflex II /Visoflex III adapter (produced 1959-1983 as part no. 16466) for lens heads:
F = 12.5 cm 1:2.5 Hektor - EF = 1.3 x
Elmar f= 13.5 cm 1:4.5 - EF = 1.2 x
Hektor f= 13.5 cm 1:4.5 - EF = 1.2 x
F = 20 cm 1:4 Telyt - EF = 1.3 x
F = 20 cm 1:4.5 Telyt - EF = 1.2 x
1:4.8 / 280 Telyt I - EF = 1.1 x
1:4.8 / 280 Telyt II - EF = 1.3 x
F = 40 cm 1:5 Telyt I - EF = 1 x
F = 40 cm 1:5 Telyt II - EF = 1 x
1:6.8 / 400 Telyt - EF = 1.5 x
1:6.8 / 560 Telyt - EF = 1.5 x

Leitz Oufro part no 16469

Oufro (model 16469Y)
An original Leitz Extension Ring (produced 1959-1983 as part no. 16469). Used with Oubio for all the longer (125mm+) Visoflex lenses and without OUBIO for 35/50mm. OUFRO can be stacked for greater magnification and will work on the Leica M Type 240 as macro for all lenses (including the Noctilux, 90mm APO-Summicron and even 21mm lenses).

 

 
  PASM in the menu of the Leica Q is most likely is made up from the letters of a mode dial on a traditional camera. Nobody knows for sure.
   

PASM (screen mode) = is short for P = Program Mode / A = Aperture Priority / S = Shutter Priority / M = Manual Control

 

 

 

Perspective - The way objects appear to the eye; their relative position and distance. Also, selective focus (foreground and background out of focus) can change the perception of perspective (also see Three-dimensional). A wide angle "widens" the perspective and makes objects further away appear smaller than they are to the eye; and objects closer, relatively larger than they are to the eye. A tele lens will "flatten" the perspective and often objects further away will appear relatively larger than close objects than they are in real life. A 50mm lens is the one closest to the perspective and enlargement ratio of the human eye.

 

Perspective is relative position and distance. As here where the girl in front is more than two times taller than the people walking, and 8 times taller than the people in the far background. Also, the parts of the buildings closer to the viewer are "taller" than the parts of the same building further away. Late afternoon sun in Denmark. Leica TL2 with Leica 35mm Summilux-TL ASPH f/1.4. © 2017 Thorsten Overgaard.
Perspective is relative position and distance. As here where the girl in front is more than two times taller than the people walking, and 8 times taller than the people in the far background. Also, the parts of the buildings closer to the viewer are "taller" than the parts of the same building further away. Late afternoon sun in Denmark. Leica TL2 with Leica 35mm Summilux-TL ASPH f/1.4. © 2017 Thorsten Overgaard.

 
  Vanishing points are the points where lines meet. This is how you make perspective in paintings and drawings (and some times make movie sets or theatre stages appear more three-dimensional than they are)
   

Painters works with vanishing points, which is where the lines meet, so as to create an illusion of perspective and three-dimensional effect on a two-dimensional painting or drawing.

The human eye corrects for perspective to an extreme degree. We always see vertical lines vertical and horisontal lines horisontal: The eye has a angle of view equivalent to an 8mm wide angle lens, a size ratio equivalent to a 50mm lens and we focus on relatively small area of the viewing field - one at the time. Three things happens that are worth paying attention to:

1) We compile areas of our view that we focus on, to one conceptual image that "we see". Ansel Adams, the great American landscape photographer pointed out that a large camera used for landscape photography capture every detail in focus and sharp so you can view it in detail after; but the eye does not see everything in focus when you try to compose the landscape photography, the eye scans only one part at a time and stitch the idea together. This makes composing or prevision of a landscape photography challenging.

2) We compile areas of our view that we individually adjust the exposure of. A camera adjust the exposure of the whole image frame to one exposure. That's why what looks like a nice picture to the eye of houses in sunshine with a blue sky above, becomes a photograph of darker buildings with a bright white sky: The camera simply can't take one picture that compare to what we "compiled" with our eyes, adjusting for each type of light.

3) Objects (on a table, for example) in the bottom of our viewing field will appear 100% perspective corrected - to a degree that it is impossible to correct in optics, with or without software correction. A wide angle lens, even with little distortion, will exaggerate the proportions of the closet part so it - to the eye - looks wrong.

 

Perspective distortion: Comparing these two photographs you can see how the cup stretches in the 28mm wide angle photograph compared to the 50mm photograph. Both actually has a little stretch because both the cup is in the edge of the frame in both photographs. © 2017 Thorsten Overgaard.
Perspective distortion: Comparing these two photographs you can see how the cup stretches in the 28mm wide angle photograph compared to the 50mm photograph. Both actually has a little stretch because both the cup is in the edge of the frame in both photographs. © 2017 Thorsten Overgaard.

 

 

 

Perspective correction - In software like Adobe Lightroom there is often a feature to correct perspective (and distortion) like seen below. You can change perspective this way, or at least make believe: If you correct a tall building on teh vertical lines, you will notice that the height of the windows doesn't match the perspective. If the building is with straight lines, the windows should all be of the same size. But a tall building seen from below and corrected with software will have taller windows (closer to camera) in the bottom than in the top (further away from the camera originally).

Perspective correction in Adobe Lightroom. © 2017 Thorsten Overgaard.  Perspective correction - In software like Adobe Lightroom there is often a feature to correct perspective (and distortion) like seen below. You can change perspective this way, or at least make believe: If you correct a tall building on teh vertical lines, you will notice that the height of the windows doesn't match the perspective. If the building is with straight lines, the windows should all be of the same size. But a tall building seen from below and corrected with software will have taller windows (closer to camera) in the bottom than in the top (further away from the camera originally).
Perspective correction in Adobe Lightroom. © 2017 Thorsten Overgaard.

 

RASUK
Sports Range Finder (1933) to mount in the hotshoe for the camera that shoved the frame for 35mm, 50mm, 73mm and 90mm. Was usef for example for photographing race cars where one would frame the car as it came, usually with a 90mm lens.

The OUFTO on Leica M Type 240The OUFTO on Leica M Type 240 with Leica 90mm APO-Summicron-M ASPH f/2.0.

 

RF
(R)ange (F)inder - the mechano-optical mechanism which allows M Leicas to focus.
Alternative meaning - RF is also shorthand for Hexar RF , Konica's motorised "M-lens-compatible" rangefinder camera released in 2000.

ROM = Digital code on Leica R lenses. It was made for the latest of the Leica R lenses in the 1990's so the Leica R8 and Leica R9 could recognize the lens; and each lens was fine-tuned with digital information for the camera to adjust exposure and other very exact. ROM contact could also be added to older R-lenses. In the Leica CL, if you have the R to L adapter and you are using ROM lenses then the camera will recognize the lens.

S = Single image. When the ring by the shutter release on top of the camera (or in the menu of a digital camera in case it does not have this ring on the ourside) is moved from OFF to S, the camera takes only one photo at the time (Single). The other possibility is Continuous (see above).

S = Single image. In the menu of the Leica TL2 you can choose between single image at the time, or Continuous where the Leica TL2 will shoot series of 20-29 pictures per second as long as you hold down the shutter release. In Single mode it takes only one photo, no matter how long you hold down the shutter release.

Saturation: How colorful, intense or pure the color is. Less saturation would be less colorful, more saturation would be more colorful. In today’s photography, desaturating a photo on the computer will gradually make it less and less colorful; and full desaturation would make it into a black and white photo.

Sensor = A device that detects a physical property (like light) and records it. A camera sensor is a plane plate with thousands of small “eyes” with a lens in front of each, which each individually records the amount of red, green and blue light rays that comes through the lens. together Red, Green and Blue form all colors of the spectrum. From Latin sens- ‘perceived’.

SDC = Software Distortion Correction. A correction of lens distortion (not straight lines) applied in the camera and which is part of the DNG file. In Lightroom the SDC of the camera file is applied automatically (and cannot be removed), in software like AccuRaw one can open the DNG file without the SDC correction. Sean Reid Reviews have written a good article on what SDC is and does in "Software Distortion Correction".

SDC (Software Distortion Correction): In Lightroom the correction profile for the Fujinon 23mm is applied automatically and cannot be turned off. If you go into Develop mode in Lightroom and look under Lens Correction > Profile, you will see a message in the bottom with an exclamation mark. When you click on that, you get the message above.
SDC (Software Distortion Correction): In Lightroom the correction profile for the Fujinon 23mm is applied automatically and cannot be turned off.
 If you go into Develop mode in Lightroom and look under Lens Correction > Profile, you will see a message in the bottom with an exclamation mark. When you click on that, you get the message above.

 

Sharpness - See “Focus”

Shoulder Stock
A Leitz mechanism attached to the (tele-) lens and held against one's shoulder when photographing, so as to stabilize the tele lens when using handheld without a tripod or monopod. The shoulder stock is attached to the lens same way as a tripod or monopod.

Shutter speed dial - The dial on top of the Leica M where you can set the shutter speed manually. It can also be set to A which stands for Aperture Priority (where the camera suggests a shutter speed; or when you move the dial away from A, the camera will show arrows in the viewfinder, suggesting which direction to change the Aperture to, to get the correct exposure).

SDC (Software Distortion Correction): In Lightroom the correction profile for the Fujinon 23mm is applied automatically and cannot be turned off. If you go into Develop mode in Lightroom and look under Lens Correction > Profile, you will see a message in the bottom with an exclamation mark. When you click on that, you get the message above.
Shutter speed dial set to 1/1000 of a second.

Slide - Short for slide film, also known as a transparency or a dia-positive (or a lantern slide as they were called in the 1800's). A transparent film in positive, and mostly in color, that can be projected onto a wall or screen in large size by putting the slide into a slide projector ("magic lantern" as they were called back in the day) that sends light through the film and projects it to a wall or screen via a lens.
In the 1930's and 1940's Walther Benser traveled the world with a slideshow of pictures made with the Leica. In the period long before the television he managed to fill large theatres with hundres and often thousands of people who were amazed by the large pictures from the "small camera" as the Leica was also known as back then.

Slide projector - Also known as "magic lantern" back in the day. Leica came out with their first projectors in the 1930's (see a list of projectors and acessories here). It's a device with a strong lamp behind a transparent picture (slide) that is projected to a wall or screen via a lens. Today we use LCD projectors which is simply a digital image on a small screen inside the projector house that is projected to a wall or screen by a lens. Early models of LCD projectors had three lenses so as to projet each channel of red, green and blue onto the wall or screen.

 

SLR = Abbreviation for Single-Lens Reflex; the lens that forms the image on the film/sensor also provides the image in the viewfinder via a mirror. Newer camera models has aen EVF (Electronic Viewfinder) that displays in the viewfinder what the sensor sees in real-time.

 

  Leitz Wetzlar Mikro-Summar 42mm
  Leitz Wetzlar Mikro-Summar 42mm f4.5 lens anno 1910 might be the first lens carrying the name Summar.

Summar - (or a story of name development)
The 1933 lens 50mm f2.0 Summar: It started out as Summar(f2.0), then the Summitar (f2.0 in 1939), then the Summarex(f1.5 in 1948), then the Summaron(35mm f.2.8 in 1948, then later f2.0, f3.5 and f5.6 lenses), then the Summarit (f1.5 in 1949 and used again for the 40mm f2.4 on the Leica Minilux in 1995, then again for the 35mm, 50mm, 75mm and 90mm Summarit f2.5 in 2007) then the Summicron(f2.0 in 1953 for the collabsible 50mm) and finally the Summilux(50mm f1.4 in 1959).
ORIGIN of Summar is unknown.

 

Summarex
The great thing about being a lens designer is that you get to name the lens. Dr. Max Berek who worked for Leitz from 1912 till his death in 1949 named lenses after his two favorite dogs. One was Sumamrex named after his dog Rex (the other Hektor named after his dog Hektor).

 

Summarit
Refers to the maximum lens aperture - here f1.5 .

Summicron = Refers to the maximum lens aperture - here f/2.0 . There are many guesses how this name came about, a popular one being that the "summi" came from "summit" (summit means the highest point of a hill or mountain; the highest attainable level of achievement) while the "cron" came from "chroma" (ie. for colour). Not so: The name (Summi)cron was used because the lens used Crown glass for the first time, which Leitz bought from Chance Brothers in England. The first batch of lenses were named Summikron (Crown = Krone in Deutsch). The Summi(cron) is a development from the orignal Summar (the 50mm f2.0 lens anno 1933). Vario-Summicron, Vario-Elmarit is Leica Camera AG's name for zoom lenses, for example the Vario-Summicron f/2.0 as the one that is on the Leica Digilux 2.

 

Summilux = Refers to the maximum lens aperture - here f1.4 , "-lux" added for "light" (ie. the enhanced light gathering abilities). In Leica terminology a Summilux is always a f/1.4 lens and a Summicron is a f/2.0 lens.

 

Telyt
Lens nomenclature - short-hand for " telephoto " (tele- is a combining form, meaning to or at a distance and used in names of instruments for operating over long distances : telemeter. The name has been used for a number of tele lenses from Leica.
ORIGIN: from Greek t?le- ‘far off.’

 

Telechron
The first name for the 800mm Telechron f/6.3 lens that Leica presented at Photokina in 1970 and made available in 1972 as the 800mm Telyt-S f/6.3.

 

Televit
rapid-focus device from Leitz that was made from 1966 through 1973, in both R and VisoflexIt was originally designed for use with the 400mm f5.6 Telyt and 560mm f5.6 Telyt. Beginning in 1970 (with serial 2340953) the Televit could also be used with the 280mm f4.8 Telyt-V by using adapter 14138.

 

Leica Thambar 90mm
A complete set of a Leitz 90mm Thambar f/2.2 consist of the original red box, lens cap, lens shade and the special soft focus filter with a black dot in the middle. They exist in both a Meter and a Feet edition (the focusing scale). Only 3,500 or less were made from 1934-1940, from serial number 226001 to 540500. Read my article on Leica 90mm lenses.

Thambar
Leitz Thambar 90mm f.2.2. At most about 3000 were made, probably in eight batches, starting with 226xxx (actually built in 1934) and going through 283xxx, 311xxx, 375xxx, 416xxx, 472xxx, 511xxx, and 540xxx (about 1939/1940).
Today they are staggeringly rare and extremely expensive: you would be lucky to get away with much less than $1500 for the lens without accessories (center spot, shade, cap), and you could easily pay twice that for a good, complete example with clean glass.
Known to be a legendary soft-focus portrait lens that 'make a woman look 10 years younger.' A glass filter with a black spot in the middle, about 13mm (1/2”) in diameter cuts out the central (sharpest) part of the image and makes everything even softer.
(Source: Roger W. Hicks)
Here are some advice from a Thambar user, Theodor Heinrichsohn, who have used it mainly for portraits using an Leica M5 and Leica M6:
1. The results are more or less unpredictable. Best practice is to shoot many times and pick the one you like best.
2. Shots against the light are generally more effective than with the light behind you.
3. The most pleasing results to my taste were with center filter at medium apertures. With luck portraits took on the "dreamy" look that the lens is famous for.
4. I never used the Thambar for anything except portraits.
The lens has been rumored to be slightly radioactive due to the process of producing the glass.
Here are some sample photos of Koichiro Itamura Photography.
Here are some more sample images from Blue Penguin.

Origin of the name is currently unknown. Suggestions has been made that the name Thambar was derived from Greek, meaning “something that inspires wonder”. Also close to the English word Tamper (with) which is to meddle, damaging or altering something.

 

Joy Villa photographed in Rome with Leica M 240 and Leitz 90mm Thambar f/2.2 at f/4.5 (with soft center filter). © 2014 Thorsten Overgaard.
Joy Villa photographed in Rome with Leica M 240 and Leitz 90mm Thambar f/2.2 at f/4.5 (with soft center filter). © 2014-2016 Thorsten Overgaard.

 

Thick / Thin
The first 90mm Elmar that came out in 1930 was called "Thick" of "Fat" when the smaller "Thin" Elmar came out in January 1933.

 

Three-dimensional = Having the three dimensions of height, width and depth. In photography and lens design, three-dimensional effect is also the perception of even small micro-details; the texture of skin can appear flat and dead or three-dimensional and alive. Also, selective focus (foreground and background out of focus) can change the perception of depth. Also see Perspective.

Three-dimensional = Having the three dimensions of height, width and depth. Melrose Avenue in Los Angeles. Leica TL2 with Leica 35mm Summilux-TL ASPH f/1.4. © 2017 Thorsten Overgaard.
Three-dimensional = Having the three dimensions of height, width and depth. Melrose Avenue in Los Angeles. Leica TL2 with Leica 35mm Summilux-TL ASPH f/1.4. © 2017 Thorsten Overgaard.

 

TTL
(T)hrough (T)he (L)ens light metering, usually WRT the flash metering capabilities built into the R6.2, R8, R9, M7 & M6TTL cameras.

Vario- is the Leica Camera AG name for zoom lenses. Vario-Elmarit, Vario-Elmar and Vario-Summicron and so on.

Joy Villa photographed in Rome with Leica M 240 and Leitz 90mm Thambar f/2.2 at f/4.5 (with soft center filter). © 2014 Thorsten Overgaard.
The Leica 35-70mm Vario-Elmarit-R f/2.8 ASPH (left) and the Leica 35-70mm Vario-Elmar-R ASPH f/4.0 (right)

 

Vulcanite
The black rubberized, textured material used to cover Leica camera bodies prior to the 1980s. It actually was made of vulcanised rubber (hence the name) and was and remains much loved by professionals because of its solid, sure grip.

Viewfinder a device on a camera showing the field of view of the lens. Also known as the German word "Messucher" (or Meßsucher).
1) A built-in viewfinder in a camera that simply show the frame you get when you look through the viewfinder.
2) A rangefinder viewfinder which is also used to focus the lens. In Leica M cameras two pictures has to meet and lay 'on top of each other' for the picture to be in focus.
3) An external viewfinder, usually on top of the camera in the flash shoe, so as to show the field of view of lenses vider than what the built-in viewfinder can show (15mm, 21mm, 24mm, 28mm etc viewfinders exist)
4) Very simple "aiming-devices" on top of a camera that is simply a metal frame without any optics. Just a frame, as for example very old cameras (the original Leica), or when using cameras in diving where you can't look through the camera.

Visoflex
A device mounted between the Leica M camera and a lens, containing a mirror mechanism like in a SLR camera, thus allowing the M user to 'preview' a picture using a tele lens larger than 135mm which is the maximum covered by the framelines in the Leica viewfinder.

Credit:
Courtesy of Oxford American, Justin Scott

 

 
 

 

 

   
   

 

– Thorsten Overgaard

   


leica.overgaard.dk
Thorsten Overgaard's Leica Article Index
Leica M cameras:   Leica S:
Leica M10   Leica S1 digital scan camera
Leica M Type 240 and M-P Typ240   Leica S2 digital medium format
Leica M-D Typ 262 and Leica M60   Leica S digital medium format
Leica M Monochrom Typ246 digital rangefinder    
Leica M Monochrom MM digital rangefinder   Leica Cine Lenses:
Leica M9 and Leica M-E digital rangefinder   Leica Cine lenses from CW Sonderoptic
Leica M9-Professional digital rangefinder    
Leica M4 35mm film rangefinder    
Leica M lenses:   Leica SLR cameras:
Leica 21mm Summilux-M ASPH f/1.4   Leica SL 2015 Type 601 mirrorless fullframe
Leica 21mm Leica Super-Elmar-M ASPH f/3.4   Leica R8/R9/DMR film & digital 35mm dSLR cameras
Leica 21mm Super-Angulon-M f/3.4   Leica R10 [cancelled]
Leica 28mm Summilux-M ASPH f/1.4   Leica R4 35mm film SLR
Leica 35mm Summilux-M ASPH FLE f/1.4 and f/1.4 AA   Leica R3 electronic 35mm film SLR
Leica 35mm Summicron-M ASPH f/2.0   Leicaflex SL/SL mot 35mm film SLR
Leica 50mm Noctilux-M ASPH f/0.95    
Leica 50mm Noctilux-M f/1.0 and f/1.2   Leica R lenses:
Leica 50mm Summilux-M ASPH f//1.4   Leica 19mm Elmarit-R f/2.8
Leica 50mm APO-Summicron-M ASPH f/2.0   Leica 35mm Elmarit-R f/2.8
Leitz 50mm Summicron-M f/2.0 "rigid" Series II   Leica 50mm Summicron-R f/2.0
Leica 75mm Summilux-M f/1.4   Leica 60mm Macro-Elmarit f/2.8
Leica 75mm APO-Summicron-M ASPH f/2.0   Leica 80mm Summilux-F f/1.4
Leica 90mm APO-Summicron-M ASPH f/2.0   Leica 90mm Summicron-R f/2.0
Leica 90mm Summarit-M f/2.5   Leica 180mm R lenses
Leica 90mm Elmarit f/2.8   Leica 400mm Telyt-R f/6.8
Leitz 90mm Thambar f/2.2   Leica 35-70mm Vario-Elmarit-R f/2.8
    Leica 35-70mm Vario-Elmarit-R f/4.0
     
History and overview:   Small Leica cameras:
Leica History   Leica Q full-frame mirrorless
Leica Definitions   Leica Digilux 2 vintage digital rangefinder
Leica Lens Compendium   Leica Digilux 1
Leica Camera Compendium   Leica X
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Color meters for accurate colors (White Balance)   "Die Magie des Lichts Finden" eBook (German)
White Balance & WhiBal   "Composition in Photography" eBook
Film in Digital Age   "The Moment of Impact in Photography" eBook
Dodge and Burn   "Freedom of Photographic Expression" eBook
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The Origin of Photography   The Overgaard Photography Extension Course
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Steve Huff Photos (reviews)   Leica Fotopark
Erwin Puts (reviews)   The Leica Pool on Flickr
LeicaRumors.com (blog)   Eric Kim (blog)
Luminous Landscape (reviews)   Adam Marelli (blog)
Sean Reid Review (reviews)   Jono Slack
Ken Rockwell (reviews)   Shoot Tokyo (blog)
John Thawley (blog)   Ming Thein (blog)
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Overgaard Workshops & Masterclasses   ventilated Shade E55 for 90mm Summicron
Artists Nights   Ventilated Shade for 28mm Summaron
    Ventilated Shade for 24mm Elmarit
Gallery Store Specials   Ventilated ShadeE60 for 50mm Noctilux and 75/1.4
 

 

 

 

 

 

 

 

 


 

Above: Joy Villa in Paris. Leica Q.

 

 



 


 

Also visit:

Overgaard Photography Workshops
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Leica Definitions
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Thorsten Overgaard
Thorsten von Overgaard is a Danish writer and photographer, specializing in portrait photography and documentary photography, known for writings about photography and as an educator. Some photos are available as signed editions via galleries or online. For specific photography needs, contact Thorsten Overgaard via e-mail.

Feel free to e-mail to thorsten@overgaard.dk for
advice, ideas or improvements.

 

 

 


 

 


 

 

 






 

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