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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. 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 ...

  4. Lens speed - Wikipedia

    en.wikipedia.org/wiki/Lens_speed

    Leica Noctilux-M 50mm f / 1.0 (Leica M mount, 1976; discontinued and replaced 2008 with a new Noctilux, see above) Canon EF 50mm f / 1.0 L USM (for Canon EOS autofocus SLRs, announced 1987, released 1989, discontinued 2009) Panavision 50mm f / 1.0 (Super-35 cine lens) Nikkor-O 50mm f / 1.0 Prototype lens for Nikkor-S Rangefinder camera; Leica ...

  5. Canon EF 85mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_85mm_lens

    The newer EF 85mm f / 1.2L II USM version, which is aesthetically the same as the EF 85 mm f / 1.2L USM, is updated with a newer CPU, 1.8 times faster autofocus, and upgraded anti-reflective lens coatings to reduce chromatic aberration, ghosting, and lens flare. [2]

  6. Canon EF lens mount - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_lens_mount

    That lens was the Canon EF 75-300mm f/4-5.6 IS USM. Canon in 2001 was the first to create a lens with DO (multi layered Diffractive Optical element) element. That lens was the Canon EF 400mm f/4 DO IS USM. Canon in 2008 created the first lens with SWC technology (Subwavelength Structure Coating). That lens was the Canon EF 24mm f/1.4L II USM ...

  7. File:Canon EF 50mm f1.4 Front & Rear.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Canon_EF_50mm_f1.4...

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