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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 collection of lenses a DSLR owner might have: 50mm F1.4, 17-40mm F4, 100mm F2.8 Macro, 24-70mm F2.8, 70-200mm F2.8. This article details lenses for single-lens reflex and digital single-lens reflex cameras (SLRs and DSLRs respectively).
This had been used by Zeiss-Ikon in their mid-level cameras of their Contaflex series, and by Kodak in early interchangeable lenses for the top-end Retina series (later going to full lenses). Canon offered four lens options: 35mm f/3.5, 50mm f/1.8, 95mm f/3.5, and 125mm f/3.5.
List of all Canon EF and EF-S lenses with technical specifications; EF lenses at the Canon Camera Museum Archived 2017-05-05 at the Wayback Machine; EF Lens Lineup Archived 2015-11-04 at the Wayback Machine at Canon USA; EF/EF-S lens chart, seems now defunct Archived 2004-09-08 at the Wayback Machine; EF-S lenses compatible with EOS-10D
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 Canon TS-E 50 mm f / 2.8L MACRO is a tilt-shift prime lens that provides the equivalent of the corresponding view camera front movements on Canon EOS camera bodies. Unlike most other EF-mount lenses, it does not provide autofocus.
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.
These lenses have an EF type mount, and fit the Canon EOS line of digital single lens reflex cameras. When used on a camera with a field of view compensation factor of 1.6x, such as the Canon EOS 400D , they provide a narrower field of view, equivalent to an 800 mm lens mounted on a 35mm frame body.
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