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  2. Canon EF-M lens mount - Wikipedia

    en.wikipedia.org/wiki/Canon_EF-M_lens_mount

    As it is designed for use with an APS-C-sized image sensor, it features the same crop factor (of roughly 1.6) as the existing EF-S lens mount. The M system is somewhat limited as Canon has issued relatively few native lenses, listed below. There is a lack of native lenses with a large aperture, the exceptions being 22 mm f / 2.0 and 32 mm f / 1 ...

  3. Tree stand - Wikipedia

    en.wikipedia.org/wiki/Tree_stand

    Tree stands or deer stands are open or enclosed platforms used by hunters. The platforms are secured to trees in order to elevate the hunter and give them a better vantage point. A tripod stand is a similar device, but because it is freestanding rather than attached to a tree, it is not technically a tree stand.

  4. M42 lens mount - Wikipedia

    en.wikipedia.org/wiki/M42_lens_mount

    M42 adapters work best on bodies with a flange depth less than or equal to the M42's flange depth, which includes the popular Canon EF-mount, the Pentax K-mount, the Minolta/Konica Minolta/Sony A-mount, the Sony E-mount, the Samsung NX-mount, the Fujifilm X-mount and the Four Thirds System including the Micro Four Thirds system. This allows the ...

  5. Canon EF lens mount - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_lens_mount

    In 1987 Canon was the first to use USM (Ultrasonic Motor) with the Canon EF 300mm f/2.8L USM. [19] In 1989 Canon was the first to create a full frame f/1.0 AF (AutoFocus) lens and the only one until today with the Canon EF 50mm f/1.0L USM. In 1993 Canon was the first to create an interchangeable 10× superzoom lens for SLR cameras.

  6. Canon EF-S lens mount - Wikipedia

    en.wikipedia.org/wiki/Canon_EF-S_lens_mount

    An example of a plastic EF-S lens mount. The Canon EF-S lens mount is a derivative of the EF lens mount created for some Canon digital single-lens reflex cameras with APS-C sized image sensors. It was released in 2003. Cameras with the EF-S mount are backward compatible with the EF lenses and, as such, have a flange focal distance of 44.0 mm ...

  7. M39 lens mount - Wikipedia

    en.wikipedia.org/wiki/M39_lens_mount

    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 ...