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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. 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.

  4. 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.

  5. Canon Extender EF - Wikipedia

    en.wikipedia.org/wiki/Canon_Extender_EF

    The Canon Extender EF lenses are a group of teleconverter lenses made by Canon. These lenses are used between any compatible EF type lens and any of the Canon EOS line of cameras. 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 ...

  6. 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]

  7. List of third-party Sony E-mount lenses - Wikipedia

    en.wikipedia.org/wiki/List_of_third-party_Sony_E...

    50mm f/1.05 [399] Cine lens 35mm T2.0 Spectrum Series [400] 50mm T2.0 Spectrum Series [401] 85mm T2.0 Spectrum Series [402] Arax. 50mm f/2.0 Tilt Shift lens [403] Artboard. Funleader 18mm f/8 LensCap [404] AstrHori. 50mm f/1.4 50mm F1.4 Tilt Lens; DZOptics. Kerlee 35mm f/1.2 [405] Entaniya. Entaniya Fisheye HAL200 (200 °FOV) [406] Entaniya ...

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