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2. Leica R bayonet - Wikipedia

   en.wikipedia.org/wiki/Leica_R_bayonet

   The distance is only 0.5 mm larger than the Nikon F-mount, which is not sufficient to make a workable adapter, however, at least one Nikon camera has been modified with a Leica R bayonet mount to take R lenses, [citation needed] and at least two manufacturers make replacement mounts, allowing many Leica R lenses to be used directly on various ...

3. Lens mount - Wikipedia

   en.wikipedia.org/wiki/Lens_mount

   The focal length is about a half that of a 135 film camera lens assuming the same angle of view." [20] "The foundation for the high picture quality of the Four Thirds system is the lens mount, which is about twice the diameter of the image circle." [21]

4. 35 mm equivalent focal length - Wikipedia

   en.wikipedia.org/wiki/35_mm_equivalent_focal_length

   The resulting images from 50 mm and 70 mm lenses for different sensor sizes; 36x24 mm (red) and 24x18 mm (blue) In photography, the 35 mm equivalent focal length is a measure of the angle of view for a particular combination of a camera lens and film or image sensor size.

5. Canon EF lens mount - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_lens_mount

   Number of Canon EF lenses sold over time (red), compared with Nikon F mount lenses (blue) The EF mount replaces its predecessor, the FD mount.The standard autofocus lens mounting technology of the time used a motor in the camera body to drive the mechanics of the focus helicoid in the lens by using a transfer lever.

6. Teleconverter - Wikipedia

   en.wikipedia.org/wiki/Teleconverter

   For example, a 2× teleconverter for a 35 mm camera enlarges the central 12×18 mm part of an image to the size of 24×36 mm in the standard 35 mm film format. Teleconverters are typically made in 1.4×, 1.7×, 2× and 3× variants, with 1.4× and 2× being the most common. A 2× teleconverter doubles the apparent focal length of a given lens ...

7. Canon EF 50mm lens - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_50mm_lens

   Front and rear views of a Canon EF50mm f/1.4 USM. The EF 50mm lenses are a group of normal prime lenses made by Canon that share the same focal length.These lenses are based on the classic double-Gauss lens, [1] with the f/1.8 being a standard six-element double-Gauss with an air gap and powers between element 2 and 3 [1] and its faster cousins adding additional elements. [2]