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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 A-1 with a FD 50/1.8 Viewfinder of a Canon A-1. The right number is the current F-number (1.8), meaning that the aperture is fairly wide open. The left number (45) indicates the approximate shutter speed of 45 −1 s (the camera can select odd shutter speeds, but does not display them)
This lens was introduced on February 21, 2002. [3]On a Nikon DX format DSLR, a 50 mm lens is cropped to the angle of a view of a short telephoto lens (~75 mm equivalent; field-of-view crop is 1.54).
The Canon EF 50 mm f/1.8 II. Three 50 mm prime lenses from Minolta with different design parameters. The left lens with lens speed 3.5 is for macro photography, where lens speed is of less concern. The middle one has lens speed 1.7, such a type comes as standard with many SLRs.
Aperture mechanism of Canon 50mm f/1.8 II lens, with five blades. Though as early as 1933 Torkel Korling had invented and patented for the Graflex large format reflex camera an automatic aperture control, [14] not all early 35mm single lens reflex cameras had the feature.
The SMC Pentax-DA 50mm f/1.8 lens is a normal prime lens for the Pentax K-mount. The 75mm equivalent focal length on APS-C cameras and fast f/1.8 aperture make it well suited for portrait photography. It uses a simple double-Gauss design of 6 elements in 5 groups.