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2. Canon EF 50mm lens - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_50mm_lens

   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]

3. Sigma 50mm f/1.4 EX DG HSM lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_50mm_f/1.4_EX_DG_HSM...

   2008. Retail info. MSRP. $730.00 USD USD. 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.

4. Sigma 50mm f/1.4 DG HSM A lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_50mm_f/1.4_DG_HSM_A_lens

   The Sigma 50mm f/1.4 DG HSM Art lens is a professional-level fixed focal length camera lens made by Sigma Corporation. It was announced at CES in January 2014 and immediately became highly anticipated amid reports that Sigma was not aiming to compete against Canon or Nikon 's 50mm prime lenses but rather the newly released Zeiss Otus 55/1.4, a ...

5. Canon EF portrait lenses - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_Portrait_Lenses

   Canon EF 85mm f/1.8 USM, a classic portrait lens. Canon makes several lenses for the EF lens mount and EF-S lens mount that are well-suited for portrait photography.These lenses may also be used for other purposes, often being suited for indoor sports photography as well, due to suitable focal length and wide aperture, though autofocus speed is an issue in sports photography that is less ...

6. Canon FD lens mount - Wikipedia

   en.wikipedia.org/wiki/Canon_FD_lens_mount

   The Canon FD lens mount is a physical standard for connecting a photographic lens to a 35mm single-lens reflex camera body. The standard was developed by Canon of Japan and was introduced in March 1971 with the Canon F-1 camera. It served as the Canon SLR interchangeable lens mounting system until the 1987 introduction of the Canon EOS series ...

7. f-number - Wikipedia

   en.wikipedia.org/wiki/F-number

   f-number. Diagram of decreasing apertures, that is, increasing f-numbers, in one-stop increments; each aperture has half the light-gathering area of the previous one. An f-number is a measure of the light-gathering ability of an optical system such as a camera lens. It is calculated by dividing the system's focal length by the diameter of the ...