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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 full-frame cameras have used the EF lens mount since 1987. In comparison with that mount, the RF mount's inner diameter is the same at 54 mm. [1] The RF mount's flange focal distance at 20 mm is much shorter than that of the Canon EF and EF-S mounts at 44 mm.
Canon FX with FL 50mm f/1.8. Canon FL refers to a lens mount standard for 35mm single-lens reflex cameras from Canon. It was introduced in April 1964 with the Canon FX camera, replacing the previous Canon R lens mount. The FL mount was in turn replaced in 1971 by the Canon FD lens mount. FL lenses can also be used on FD-mount cameras.
The Canon EOS R camera uses the Canon RF lens mount. The following lens models were available at the release date: [32] Canon RF 35mm F1.8 Macro IS STM; Canon RF 50mm F1.2 L USM; Canon RF 24-105mm F4 L IS USM; Canon RF 28-70mm F2 L USM; A Canon EF lens mounted to the EOS R via a Mount Adapter EF-EOS R
Canon RF 50mm F1.2L USM: 2018-09-05 50 77 108 89.8 950 16 0.4 0.19 Canon RF 50mm F1.8 STM: 2020-12-01 50 43 69.2 40.5 160 22 0.3 0.25 Canon RF-S 55–210 mm F5–7.1 IS STM: 2023-02-08 4.5 stage stabilitzer: 55 210 55 135 69 270 32 22 0.73 1 0.28 0.05 Canon RF 70-200mm F2.8L IS USM: 2019-11-01 5 stage stabilizer: 70 200 77 146 89.9 1070 32 0.7 0.23
In 1987 Canon was the first to use USM (Ultrasonic Motor) with the Canon EF 300mm f/2.8L USM. [19] In 1989 Canon was the first to create a full frame f/1.0 AF (AutoFocus) lens and the only one until today with the Canon EF 50mm f/1.0L USM. In 1993 Canon was the first to create an interchangeable 10× superzoom lens for SLR cameras.
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