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135 film. The film is 35 mm (1.4 in) wide. Each image is 24×36 mm in the most common "small film" format (sometimes called "double-frame" for its relationship to the "single-frame" 35 mm movie format or full frame after the introduction of 135 sized digital sensors; confusingly, "full frame" was also used to describe the full gate of the movie format half the size).
Barnack tried various types of lenses, trying to find the best quality images. At the time, lenses for existing 35mm cameras covered the 18×24 mm frame format, so the larger Leica frame size was only partially covered. Existing Leitz and competing Zeiss lenses were either too large for the camera or would not cover the 24x36 frame.
In the US, size names are often denoted with a code of the format nR, where the number n represents the length of the shorter edge in inches. In the normal series, the long edge is the length of the short edge plus 2 inches (10 in or less) or 3 inches (11 in and above).
Featuring a 13.89 Megapixel (4560 x 3048 pixels total) full frame 24 x 36 mm CMOS sensor, the DCS Pro 14n was the second full-frame digital SLR to reach the market, after the unsuccessful and short lived Contax N Digital and came one day before the successful Canon EOS-1Ds.
Barnack resorted to a Leitz Mikro-Summar 1:4.5/42 mm lens for the prototype, but to achieve resolution necessary for satisfactory enlargement, the 24x36 mm format needed a lens designed specially for it. The first Leica lens was a 50 mm f /3.5 design based on the Cooke triplet of 1893, adapted by Max Berek at Leitz. The lens has five elements ...
35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the crop factor of the sensor. Typical crop factors are 1.26× – 1.29× for Canon (1.35× for Sigma "H") APS-H format, 1.5× for Nikon APS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6× for Canon APS-C format, 2× for Micro Four Thirds format, 2.7× for 1-inch ...