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  2. List of Canon products - Wikipedia

    en.wikipedia.org/wiki/List_of_Canon_products

    Canon NS (1939) New Standard. A Canon S without the slow shutter speeds. Canon J (1939) J stands for Junior a non-rangefinder model. Canon J II (1946) Similar if not the same as prewar cameras. Canon S (1946) Similar if not the same as prewar cameras. Canon S II (1946) A redesign with combined range finder and viewfinder functions – two windows.

  3. Canon PowerShot G - Wikipedia

    en.wikipedia.org/wiki/Canon_PowerShot_G

    The Canon PowerShot G is a series of digital cameras introduced by Canon in its PowerShot line in 2000. The G series cameras are Canon's flagship compact models aimed at photography enthusiasts desiring more flexibility than a typical point-and-shoot without the bulk of a digital single-lens reflex camera .

  4. Canon Inc. - Wikipedia

    en.wikipedia.org/wiki/Canon_Inc.

    Canon Inc. ( Japanese: キヤノン株式会社; [ note 1] Hepburn: Kyanon kabushiki gaisha) is a Japanese multinational corporation headquartered in Ōta, Tokyo, specializing in optical, imaging, and industrial products, such as lenses, cameras, medical equipment, scanners, printers, and semiconductor manufacturing equipment. [ 4]

  5. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    Eyeglass prescription. Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.

  6. Canonet G-III QL17 - Wikipedia

    en.wikipedia.org/wiki/Canonet_G-III_QL17

    Canonet G-III QL17. The Canon Canonet G-III QL17 is a coupled- rangefinder, leaf-shuttered, fixed-focal-length 35 mm camera first manufactured by Canon in 1972. It features fully shutter-priority automatic exposure and fully manual shooting modes. The Canonet G-III is the third generation of Canonet, following the original Canonet and the New ...

  7. Prism correction - Wikipedia

    en.wikipedia.org/wiki/Prism_correction

    Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [ 2]

  8. Adjustable-focus eyeglasses - Wikipedia

    en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

    Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both. Current bifocals and progressive lenses are static, in that the user has to change their eye position ...

  9. Canon EF 50-200mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_50-200mm_lens

    The Canon EF 50-200mm f/3.5-4.5 is an EF mount normal -to- telephoto zoom lens. It is one of the first lenses in the Canon EF series. [ 1] In June 1988, Canon announced the EF 50-200mm f/3.5-4.5L lens. This lens has very similar physical qualities compared to the EF50-200mm f/ 3.5-4.5. [ 2]

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