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2. Lens adapter - Wikipedia

   en.wikipedia.org/wiki/Lens_Adapter

   This lens adapter is a passive adapter designed for mounting a Nikon F-mount lens to a Micro Four Thirds camera. Active lens adapter: Canon EF to Sony E. In photography and videography, a lens adapter is a device that enables the use of camera and lens combinations from otherwise incompatible systems. The most simple lens adapter designs ...

3. Nikon F-mount teleconverter - Wikipedia

   en.wikipedia.org/wiki/Nikon_F-mount_teleconverter

   AF-S Teleconverter TC-14E II. The Nikon F-mount teleconverters are a group of magnifying lenses mounted between the lens and camera bodies using the Nikon F-mount.Currently, 1.4x, 1.7x and 2x converters are available separately; a fourth, the 1.25x, is available only with Nikon's newest 800mm supertelephoto lens.

4. Flange focal distance - Wikipedia

   en.wikipedia.org/wiki/Flange_focal_distance

   Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus [1] or register, depending on the usage and source) of a lens mount system is the distance from the ...

5. M42 lens mount - Wikipedia

   en.wikipedia.org/wiki/M42_lens_mount

   Canon: All DSLRs need full manual control. With certain adapters, metering and focus confirmation is available. Nikon: All DSLRs need full manual control. Focus confirmation is available, focus to infinity is only possible with adapter with additional lens. Four Thirds: All DSLRs need full manual control. Image stabilisation works.

6. Teleconverter - Wikipedia

   en.wikipedia.org/wiki/Teleconverter

   A teleconverter (sometimes called tele extender) is a secondary lens mounted between a camera and a photographic lens which enlarges the central part of an image obtained by the lens. 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 .

7. Lens mount - Wikipedia

   en.wikipedia.org/wiki/Lens_mount

   Lens mounts of competing manufacturers (Sony, Nikon, Canon, Contax/Yashica, Pentax, etc.) are almost always incompatible. In addition to the mechanical and electrical interface variations, the flange focal distance from the lens mount to the film or sensor can also be different.