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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]
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 .
while shutter speeds in reciprocal seconds have a few conventional differences in their numbers (1 ⁄ 15, 1 ⁄ 30, and 1 ⁄ 60 second instead of 1 ⁄ 16, 1 ⁄ 32, and 1 ⁄ 64). In practice the maximum aperture of a lens is often not an integral power of √ 2 (i.e., √ 2 to the power of a whole number), in which case it is usually a half ...
The Canon Extender EF lenses are a group of teleconverter lenses made by Canon. These lenses are used between any compatible EF type lens and any of the Canon EOS line of cameras. When used with a compatible lens, they will multiply the focal length of the lens by a factor of either 1.4x or 2x, at the cost of decreasing the lens' aperture by 1 ...
Canon FD 50 mm f /1.4 on AE-1 Program. Like its FL predecessor, the FD mount system allowed automatic diaphragm function, but in addition, a new signal pin supported full-aperture metering. A second signal pin for the "auto" setting of the aperture dial, plus a linkage to allow the camera to set the degree of diaphragm opening, enabled integral ...
The smallest aperture is not adjusted for. The camera always displays apertures up to f/22, but with a red line down to f/16, to remind the user that some lenses, like the Canon FD 50 mm 1:1.4 S.S.C. has its smallest aperture at f/16, while some, like the Canon FD 135 mm 1:2.5 S.C. can stop down to f/22.
The Sigma 50mm f / 1.4 EX DG HSM is a normal prime lens made by the Sigma Corporation. The lens is produced in Canon EF mount , Four Thirds System , Nikon F-mount , Pentax K mount , Sigma's own SA mount , and the Sony/Minolta AF Mount varieties, all have the same optical formula.
Canon FX with FL 50mm f/1.8. Canon FL refers to a lens mount standard for 35mm single-lens reflex cameras from ... (15.3 oz) 200 FL 200mm f/3.5 I: f /3.5–22: Mar 1964:
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