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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/.../Sigma_50mm_f/1.4_EX_DG_HSM_lens

    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. [1] 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 lens costing US$4,000. [2]

  5. Lens speed - Wikipedia

    en.wikipedia.org/wiki/Lens_speed

    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.

  6. Double-Gauss lens - Wikipedia

    en.wikipedia.org/wiki/Double-Gauss_lens

    The design is presently used in inexpensive-but-high-quality fast lenses such as the Sony FE 50mm f / 1.8, the Canon EF 50mm f / 1.8 and the Nikon 50 mm f / 1.8D AF Nikkor. It is also used as the basis for faster designs, with elements added, such as a seventh element as in both Canon [ 35 ] and Nikon's 50 mm f / 1.4 offerings [ 36 ] or an ...

  7. Canon EF-S lens mount - Wikipedia

    en.wikipedia.org/wiki/Canon_EF-S_lens_mount

    The EF-S lens mount is a relatively new offering from Canon, so the selection of available lenses is limited compared to the full EF range, but it is backward compatible with the EF mount, and can therefore still accept all EF lenses. The variety of EF-S prime lenses is very limited in comparison to EF-S zoom lenses, with three primes to nine ...

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