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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 .
The fastest lenses for the common 35 mm film format in general production have apertures of f /1.2 or f /1.4, with more at f /1.8 and f /2.0, and many at f /2.8 or slower; f /1.0 is unusual, though sees some use. When comparing "fast" lenses, the image format used must be considered.
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 ...
Prime lenses have large apertures, compared with zoom lenses. These 85 mm lenses have maximum apertures of f /1.8 (left) and f /1.2 (right). In film and photography, a prime lens is a fixed focal length photographic lens (as opposed to a zoom lens), typically with a maximum aperture from f2.8 to f1.2. The term can also mean the primary lens in ...
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.
82×68 mm (3.2×2.7 in) 500 g (18 oz) 28 FL 28mm f/3.5: f /3.5–16: Dec 1966: 7/7: 0.4 m (1.3 ft) (0.09×) 58: 65×40 mm (2.6×1.6 in) 240 g (8.5 oz) 35 FL 35mm f/2.5: f /2.5–16: Mar 1964: 7/5: 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 ...
The EF 35mm f / 1.4L II USM is a successor of the EF 35mm f / 1.4L USM. It was announced at the 27th of August 2015 and is available since October same year. [1] The EF 35mm f / 1.4L II USM lens is the first lens in Canon line up to use a Blue Spectrum Refractive Optics element (BR element) to reduce the chromatic aberration at the blue end of the spectrum. [2]
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