The
EF 50mm lenses are a group of
normal prime lenses made by
Canon that share the same
focal length. These lenses are based on the classic
double-Gauss lens,
[1] with the f/1.8 being a standard six-element double-Gauss with an air gap and powers between element 2 and 3
[2] and its
fastercousins adding additional elements.
[3] The 50mm focal length, when used with a 35mm film or full-frame sensor, has been widely considered to match the perspective seen by the human eye.
[4]
Canon 50mm lenses have an
EF type mount that fits the Canon
EOS line of cameras. When pairing a 50mm lens to a Canon DSLR with an
APS-Csized sensor, the
crop factor effectively turns the 50mm focal length into a 80mm field of view.
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