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2. Battery grip - Wikipedia

   en.wikipedia.org/wiki/Battery_grip

   Sony Alpha 700 with battery grip N50. A battery grip is an accessory for an SLR/DSLR (and occasionally other cameras), which allows the camera to hold multiple batteries to extend the battery life of the camera, and adds a vertical grip with an extra shutter release (and other controls), facilitating the shooting of portrait photography. [1]

3. Sigma SA-mount - Wikipedia

   en.wikipedia.org/wiki/Sigma_SA-mount

   Newer lenses with Sigma SA-mount can be used on newer Sony E-mount cameras (for example, the Sony ILCE-7 series, the ILCE-5000, ILCE-6000 etc.) using the Sigma MC-11 SA-E mount adapter, introduced in 2016. (A similar Sigma MC-11 EF-E adapter is available to mount Canon EF-mount lenses on Sony E-mount cameras.) The adapters support autofocus ...

4. Canon BG-ED3 - Wikipedia

   en.wikipedia.org/wiki/Canon_BG-ED3

   A Canon EOS 10D digital SLR with a BG-ED3 battery grip. The Canon BG-ED3 is a battery grip manufactured by Canon for certain models of its EOS digital SLR camera range. It was originally designed for the Canon EOS D30. [1] It can hold 2 BP-511 or BP-511A batteries, effectively doubling the battery life of these cameras. [2]

5. Sigma Corporation - Wikipedia

   en.wikipedia.org/wiki/Sigma_Corporation

   Sigma has made a number of film SLR cameras, including the SA-300, SA-5, SA-7 and SA-9.. Up until the Sigma FP, [7] all Sigma SLR, DSLR, and mirrorless cameras used the Sigma SA mount, which is mechanically similar to the Pentax K mount and electrically an adaptation of the Canon EF lens mount lens control system.

6. 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 ...

7. 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 ...