Different Camera Lens Mounts at Wallpaper

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Different Camera Lens Mounts. This flange focal distance varies for all the four types of canon interchangeable lens cameras. Flange focal distance for different canon.

35mm SLR Lens mount identification guide West Yorkshire Cameras
35mm SLR Lens mount identification guide West Yorkshire Cameras from wycameras.com

An oldie but a goodie. In order to guarantee compatibility between different lenses and cameras the following standard lens mounts are defined: Petri only made one lens mount, but they also used m42 mounts.

35mm SLR Lens mount identification guide West Yorkshire Cameras

So, the lens mount is also different. The rear of the lens sometimes protrudes into the camera body and can cause damage to the interior! Most adapters or modifications will need to include a means to focus the lens. Canon eos film and digital slrs can, on the other hand, accept almost anything but a canon fd lens with adapters: