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  2. Canon EF 20mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_20mm_lens

    The Canon EF 20 mm f / 2.8 USM lens is an ultra-wide-angle prime lens produced by Canon for the EF lens mount. It features an ultrasonic motor. On a camera with an APS-C sensor the focal length is equivalent to 32 mm, and it is classified as a wide-lens. It features a ring-type USM motor featuring full-time manual and a fixed front element.

  3. Canon EF lens mount - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_lens_mount

    In 1993 Canon created the first Super UD (Ultra low Dispersion) lens with the Canon EF 400mm f/5.6L USM. In 1995 Canon created the first lens with IS (Image Stabilization). 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.

  4. Lenses for SLR and DSLR cameras - Wikipedia

    en.wikipedia.org/wiki/Lenses_for_SLR_and_DSLR...

    The gold-plated electronic contacts of an EF-mount lens. Canon introduced the EF-lens mount in 1987 as part of the EOS system. It broke with the most common technique for implementing autofocus at that time by not having a mechanical connection to a motor in the camera body, having instead only electrical connections and requiring a motor to be ...

  5. Canon EF 20-35mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_20-35mm_lens

    The EF 20–35mm lens is a wide-angle lens made by Canon Inc., with an EF mount. There are two models, an L-series f / 2.8L [1] ...

  6. List of Canon products - Wikipedia

    en.wikipedia.org/wiki/List_of_Canon_products

    Canon developed and produced the Canon FD lens mount standard for film SLR cameras from 1971 to replace the FL lens mount standard. The FD mount had two variants – original lenses used a breechlock collar to mount whilst later versions used a standard bayonet twist lock with a short twist action. The EF lens mount standard superseded FD ...

  7. 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 ...

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