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  2. Shoppers love this $7 eyeglass cleaning kit to get lenses ...

    www.aol.com/lifestyle/shoppers-love-this-7...

    Originally retailing for $10, the Koala Eyeglass Lens Cleaner kit is really a no-brainer buy, and at $7 it's a must-buy. It's not only wildly affordable but it's wildly effective. It's not only ...

  3. Photochromic lens - Wikipedia

    en.wikipedia.org/wiki/Photochromic_lens

    A photochromic eyeglass lens, part of the lens darkened after exposure to sunlight while the other part remained covered. A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their clear state.

  4. List of photographic equipment makers - Wikipedia

    en.wikipedia.org/wiki/List_of_photographic...

    Some camera companies make no lenses, but usually at least sell a lens from some lens maker with their cameras as part of a package. Note that many optical instruments such as microscopes , telescopes , spotting scopes and so forth can be used as photographic lenses; manufacturers of these types of equipment are not included here (unless they ...

  5. Nikkor - Wikipedia

    en.wikipedia.org/wiki/Nikkor

    Nikkor is the brand of lenses produced by Nikon Corporation, including camera lenses for the Nikon F-mount. Nikko parent company brand, from which the Nikkor brand evolved. The Nikkor brand was introduced in 1932, a Westernised rendering of an earlier version Nikkō (日光), an abbreviation of the company's original full name Nippon Kōgaku ...

  6. Photographic lens design - Wikipedia

    en.wikipedia.org/wiki/Photographic_lens_design

    The type of lens being designed is significant in setting the key parameters. Prime lens - a photographic lens whose focal length is fixed, as opposed to a zoom lens, or that is the primary lens in a combination lens system. Zoom lenses - variable focal length lenses. Zoom lenses cover a range of focal lengths by utilising movable elements ...

  7. List of lens designs - Wikipedia

    en.wikipedia.org/wiki/List_of_lens_designs

    This list covers optical lens designs grouped by tasks or overall type. The field of optical lens designing has many variables including the function the lens or group of lenses have to perform, the limits of optical glass because of the index of refraction and dispersion properties, and design constraints including realistic lens element center and edge thicknesses, minimum and maximum air ...

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