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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]
The 100 mm f/2 on the left is incompatible with Canon Extenders, unlike the 70-200mm f/2.8 IS on the right. 300mm f/2.8 IS lens, no extender 300mm f/2.8 IS lens, 1.4× extender 300mm f/2.8 IS lens, 2.0× extender. These Extender EF lenses can only be used with lenses that have a compatible mount.
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.
As of 2023, Canon also makes autofocus 50mm and 85mm f / 1.2 lenses, while Nikon makes a manual focus 58mm f / 0.95 lens and autofocus 50 and 85mm f / 1.2 lenses; see Canon EF 50mm lenses and Canon EF 85mm lenses for details. Pentax makes a 50mm f / 1.4 lens and 55mm f / 1.4 lens for APS-C cameras; see Pentax lenses.
The "S" in EF-S has variously been described by Canon as coming from either "Small image circle" [1] (the lens projects a smaller image circle than normal EF lenses to match the sensor), or "Short back focus" [2] (the smaller mirror used in APS-C cameras also allows optical elements to protrude further into the camera body, reducing the minimum ...
The Canon FD 55mm ƒ/1.2 AL is a camera lens made by Canon, first introduced alongside the Canon F-1 single-lens reflex camera in March 1971. It was the first lens for any 35mm SLR system to incorporate an aspherical element. [1] The lens was manufactured until 1980.
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