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The M39 lens mount is a screw thread mounting system for attaching lenses to 35 mm cameras, primarily rangefinder (RF) Leicas. It is also the most common mount for Photographic enlarger lenses. True Leica Thread-Mount (LTM) is 39 mm in diameter and has a thread of 26 turns-per-inch or threads-per-inch (tpi) (approximately 0.977 mm pitch) of ...
The coupled rangefinder had a very long baseline, with its own eyepiece next to that of the viewfinder. Other main differences included focusing drive built into the camera body for use with standard lens, removable back, shutter speed knob integral with film wind knob placed at the front of the camera body, and finished in black.
Where the Canon cameras surpass the Leica is the finder. Viewfinder and rangefinder are integrated, and a three-way switch allows a view for 50mm, 100mm, and critical rangefinder use. This arrangement made the viewfinders on Canon II/III/IV cameras tend to be dimmer and less brilliant than their counterparts found in Leica or other Barnack ...
Not itself a rangefinder camera, the Leica I of 1925 had popularized the use of accessory rangefinders. The Leica II and Zeiss Contax I, both of 1932, were great successes as 35 mm rangefinder cameras, while on the Leica Standard, also introduced in 1932, the rangefinder was omitted. The Contax II (1936) integrated the rangefinder in the center ...
The Canon EF 75–300mm f / 4–5.6 III lens. Introduced in 1991, the Canon EF 75–300mm f / 4–5.6 lens is a telephoto zoom lens for Canon EOS single-lens reflex cameras with an EF lens mount. There are 3 basic types of the lens: the IS USM (Image Stabilization, Ultra Sonic Motor), the USM (USM, no IS) and non-USM (no USM, no IS).
The first lenses were plain stop-down design, but many manufacturers extended the M42 lens mount to provide extra features. The first innovation was the pre-select type, which allowed an aperture value to be pre-selected without actually closing the aperture, with a separate ring to close down the aperture quickly to the chosen value.
Unlike the Leica screw mount version of the same lens, this one is not rangefinder coupled. There are multiple versions of Jupiter-8 lens available in Contax/Kiev mount. The -M version of the lens has click stops on aperture ring and the -NB version uses the external bayonet – it was introduced with Kiev 5, which does not have the internal one.
The second Prominent (stylized with small caps as ProminenT) was a line of 35mm interchangeable lens cameras built after World War II in the 1950s, equipped with leaf shutters. The second line of Prominent cameras were marketed as professional system cameras against the Leica threadmount and M bayonet mount and Zeiss Ikon Contax rangefinder ...
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