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The Canon EF 40mm lens is a standard prime lens with a maximum aperture of f/2.8 featuring Canon's new stepping motor (STM) technology.
They allow the use of P6 lenses on Mamiya 645, Pentax 645 and Contax 645 medium format cameras, Canon EF, Canon FD, Nikon F, Minolta AF, Minolta MD, Contax/Yashica, Pentax K, M42, and Leica R 35 mm cameras, as well as Lumix and Olympus micro 4/3 (m4/3), 4/3 system.