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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]
For example, the Canon EF 50mm f / 1.8 II or Nikon AF Nikkor 50mm f / 1.8D are very inexpensive, but quite fast and optically well-regarded. Old fast manual focus lenses, such as the Nikkor-S(C) or Nikkor AI-S 50mm f / 1.4, or Canon's FD and M39 counterparts, were historically produced abundantly, and are thus sold relatively inexpensively on ...
[1] When used on a digital crop body with a field of view compensation factor of 2× (Four Thirds body), it provides a field of view equivalent to a 100 mm lens mounted in a 35 mm body. In a 1.6× body, such as the Canon EOS 7D, it provides a narrower field of view, equivalent to an 80 mm lens mounted on a 35 mm frame body.
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 or 2 stops respectively. For example, using a 1.4x or 2x extender with the Canon EF 500mm f/4L IS USM would result in a 700mm f/5.6 or 1000mm f/8 lens.
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 Canon EF-M lens mount, introduced in 2012, ... There is a lack of native lenses with a large aperture, the exceptions being 22 mm f / 2.0 and 32 mm f / 1.4. In ...
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