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Front and rear views of a Canon EF50mm f/1.4 USM. 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 [1] and its faster cousins adding additional elements. [2]
Canon FX with FL 50mm f/1.8. Canon FL refers to a lens mount standard for 35mm single-lens reflex cameras from Canon. It was introduced in April 1964 with the Canon FX camera, replacing the previous Canon R lens mount. The FL mount was in turn replaced in 1971 by the Canon FD lens mount. FL lenses can also be used on FD-mount cameras.
Each lens contains a motor to focus, unlike the body-integral AF system pioneered by Minolta. All are readily identifiable by a boxy area on the upper left (viewed from the camera) containing the motor, and a red ring around the front lens element. The lenses are: AC 50mm f/1.8; AC 35-70mm f/3.5-4.5; AC 75-200mm f/4.5
A fast prime (fixed focal length) lens, the Canon 50mm f / 1.4 (left), and a slower zoom lens, the Canon 18–55mm f / 3.5–5.6 (right); this lens is faster at 18mm than it is at 55mm. Lens speed is the maximum aperture diameter, or minimum f-number , of a photographic lens .
It starts off "The EF 50mm lens is a normal prime lens made by Canon Inc", implying that it talks about a single lens. In fact, it talks about six completely different lenses. Two of these are no longer in production, so the use of the present tense in the opening sentence seems dubious.
C. Canon EF 8-15mm lens; Canon EF 11–24mm lens; Canon EF 15mm lens; Canon EF 16-35mm lens; Canon EF 17-35mm lens; Canon EF 22-55mm lens; Canon EF 24-85mm lens
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