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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]
So a standard 50 mm lens for 35 mm photography acts like a 50 mm standard "film" lens even on a professional digital SLR, but would act closer to a 75 mm (1.5×50 mm Nikon) or 80 mm lens (1.6×50mm Canon) on many mid-market DSLRs, and the 40-degree angle of view of a standard 50 mm lens on a film camera is equivalent to a 28–35 mm lens on ...
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 .
35 mm equivalent focal lengths are calculated by multiplying the actual focal length of the lens by the crop factor of the sensor. Typical crop factors are 1.26× – 1.29× for Canon (1.35× for Sigma "H") APS-H format, 1.5× for Nikon APS-C ("DX") format (also used by Sony, Pentax, Fuji, Samsung and others), 1.6× for Canon APS-C format, 2× for Micro Four Thirds format, 2.7× for 1-inch ...
With a 1.5× body such as the Nikon D300, it provides a less narrow field of view, equivalent to a 75 mm lens mounted on a 35 mm frame body. With a 1.3× body such as the Canon EOS-1D Mark III, it provides an even less narrow field of view, equivalent to a 65 mm lens mounted on a 35 mm frame body.
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 maximum aperture for a zoom lens may be the same (constant) for all focal lengths, but it is more common that the maximum aperture is greater at the wide-angle end than at the telephoto end of the zoom range. For example, a 100 mm to 400 mm lens may have a maximum aperture of f/4.0 at the 100 mm end but will diminish to only f/5.6 at the ...
0.4 m (1.3 ft) (0.115×) 58: 63×55 mm (2.5×2.2 in) 352 g (12.4 oz) FL 35mm f/3.5: f /3.5–16: May 1968: 6/6: 0.4 m (1.3 ft) (0.106×) 48: 62×43 mm (2.4×1.7 in) 270 g (9.5 oz) 38 FLP 38mm f/2.8: f /2.8–16: May 1965: 4/3: 0.8 m (2.6 ft) (0.054×) 48: 66×21 mm (2.6×0.8 in) 210 g (7.4 oz) [b] Normal lenses [c] 50 FL 50mm f/1.4: f /1.4–16 ...
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