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  2. Leupold & Stevens - Wikipedia

    en.wikipedia.org/wiki/Leupold_&_Stevens

    Leupold & Stevens, Inc. is an American manufacturer of telescopic sights, red dot sights, binoculars, rangefinders, spotting scopes, and eyewear located in Beaverton, Oregon, United States. The company, started in 1907, is on its fifth generation of family ownership.

  3. Wray (lenses) - Wikipedia

    en.wikipedia.org/wiki/Wray_(lenses)

    Wray (Optical Works) Ltd. was a British camera and lens manufacturer based in Ashgrove Road, Bromley, Kent, UK. It operated from 1850 to 1971, making lenses for cameras, photographic enlargers, reconnaissance, mapping, microchip replication, and an anamorphic projection system for cinemas. It also made binoculars.

  4. Binoculars - Wikipedia

    en.wikipedia.org/wiki/Binoculars

    Some binoculars have adjustable magnification, zoom binoculars, such as 7-21×50 intended to give the user the flexibility of having a single pair of binoculars with a wide range of magnifications, usually by moving a "zoom" lever. This is accomplished by a complex series of adjusting lenses similar to a zoom camera lens.

  5. M39 lens mount - Wikipedia

    en.wikipedia.org/wiki/M39_lens_mount

    The M39 lens mount is a screw thread mounting system for attaching lenses to 35 mm cameras, primarily rangefinder (RF) Leicas. It is also the most common mount for Photographic enlarger lenses. True Leica Thread-Mount (LTM) is 39 mm in diameter and has a thread of 26 turns-per-inch or threads-per-inch (tpi) (approximately 0.977 mm pitch) of ...

  6. Bifocals - Wikipedia

    en.wikipedia.org/wiki/Bifocals

    Research continues in an attempt to eliminate the limited field of vision in current bifocals. New materials and technologies may provide a method which can selectively adjust the optical power of a lens. Researchers have constructed such a lens using a liquid crystal layer applied between two glass substrates. [citation needed]

  7. Canon EF 80-200mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_80-200mm_lens

    f / 2.8 f / 4.5–5.6 Minimum aperture (Max F Stop) f / 32 f / 29 f / 22–27 f / 29 Filter diameter 72 mm 52 mm Horizontal viewing angle: Vertical viewing angle: Diagonal viewing angle: 30°–12° Physical data Weight 1,330 g 275 g 260 g 250 g Max. Diameter x Length 84 mm x 185.7 mm 71.2 mm x 77.8 mm 69 mm x 78.5 mm Groups/elements 13/16 7/10

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