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  2. Armageddon (Prism album) - Wikipedia

    en.wikipedia.org/wiki/Armageddon_(Prism_album)

    Armageddon is the third studio album by Canadian rock band Prism, released in June 1979 by Capitol Records. It achieved double platinum status in Canada (in excess of 200,000 units sold). [2] Armageddon is notable for several reasons. Bruce Fairbairn received the Canadian music industry 1980 Juno Award for Producer of the Year for the album.

  3. History of the single-lens reflex camera - Wikipedia

    en.wikipedia.org/wiki/History_of_the_single-lens...

    The history of the single-lens reflex camera (SLR) begins with the use of a reflex mirror in a camera obscura described in 1676, but it took a long time for the design to succeed for photographic cameras. The first patent was granted in 1861, and the first cameras were produced in 1884, but while elegantly simple in concept, they were very ...

  4. Zenni Optical - Wikipedia

    en.wikipedia.org/wiki/Zenni_Optical

    Website. www .zennioptical .com. Zenni Optical (formerly 19dollareyeglasses.com) is an American online retailer of prescription glasses and sunglasses. Founded in 2003 by Tibor Laczay and Julia Zhen, it is based in Novato, California . The company sells more than 2,000 types of prescription glasses and sunglasses but does not sell contact lenses.

  5. Maddox rod - Wikipedia

    en.wikipedia.org/wiki/Maddox_rod

    The strength of the prism is increased until the streak of the light passes through the centre of the prism, as the strength of the prism indicates the amount of deviation present. The Maddox rod is a handheld instrument composed of red parallel plano convex cylinder lens , which refracts light rays so that a point source of light is seen as a ...

  6. Walmart - Wikipedia

    en.wikipedia.org/wiki/Walmart

    Walmart Inc. ( / ˈwɔːlmɑːrt / ⓘ; formerly Wal-Mart Stores, Inc.) is an American multinational retail corporation that operates a chain of hypermarkets (also called supercenters), discount department stores, and grocery stores in the United States, headquartered in Bentonville, Arkansas. [10]

  7. Anisometropia - Wikipedia

    en.wikipedia.org/wiki/Anisometropia

    Amblyopia. Anisometropia is a condition in which a person's eyes have substantially differing refractive power. [1] Generally, a difference in power of one diopter (1D) is the threshold for diagnosis of the condition . [2] [3] Patients may have up to 3D of anisometropia before the condition becomes clinically significant due to headache, eye ...

  8. Petzval lens - Wikipedia

    en.wikipedia.org/wiki/Petzval_lens

    Petzval portrait lens. The Petzval objective, or Petzval lens, is the first photographic portrait objective lens (with a 160 mm focal length) in the history of photography. [1] It was developed by the Slovak mathematics professor Joseph Petzval in 1840 in Vienna, [2] with technical advice provided by Peter Wilhelm Friedrich von Voigtländer [ de].

  9. Frazier lens - Wikipedia

    en.wikipedia.org/wiki/Frazier_lens

    A Frazier Lens on a RED One camera. The Frazier lens is a special camera lens designed by Australian photographer Jim Frazier. The Frazier lens provides an appearance of a massive depth of field, allowing the foreground and background of an image to be in focus. Frazier's lenses have been widely used in Hollywood and wildlife cinematography.

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