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  2. Samyang 500mm f/8 - Wikipedia

    en.wikipedia.org/wiki/Samyang_500mm_f/8

    The Samyang 500mm F8.0 MC Mirror is a supertelephoto lens and is designed for full frame DSLRs. [1] It is a mirror lens. The lens is made in South Korea by Samyang Optics and marketed under several brand names, including Rokinon and Walimex. The lens uses manual focus only. As all mirror lenses, it cannot change the aperture.

  3. Optical coating - Wikipedia

    en.wikipedia.org/wiki/Optical_coating

    Optically coated mirrors and lenses. An optical coating is one or more thin layers of material deposited on an optical component such as a lens, prism or mirror, which alters the way in which the optic reflects and transmits light. These coatings have become a key technology in the field of optics.

  4. Mirrored sunglasses - Wikipedia

    en.wikipedia.org/wiki/Mirrored_sunglasses

    A person wearing mirrored sunglasses. Mirrored sunglasses are sunglasses with a reflective optical coating (called a mirror coating or flash coating) on the outside of the lenses to make them appear like small mirrors. The lenses typically give the wearer's vision a brown or grey tint. The mirror coating decreases the amount of light passing ...

  5. Corrective Optics Space Telescope Axial Replacement

    en.wikipedia.org/wiki/Corrective_Optics_Space...

    One potential option was to insert corrective optics, lenses or mirrors in the telescope tube between the primary mirror and the secondary reflector. However the tube was too narrow for even the smallest astronaut to slither down it, leading to a search for a means of inserting the required corrective components into the tube.

  6. Catadioptric system - Wikipedia

    en.wikipedia.org/wiki/Catadioptric_system

    Examples of sub-aperture corrector catadioptric telescopes include the Argunov–Cassegrain telescope, the Klevtsov–Cassegrain telescope and sub-aperture corrector Maksutovs, which use as a "secondary mirror" an optical group consisting of lens elements and sometimes mirrors designed to correct aberration, as well as Jones-Bird Newtonian ...

  7. Contact lens - Wikipedia

    en.wikipedia.org/wiki/Contact_lens

    Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, [ 1 ] and they can be worn to correct vision or for cosmetic or therapeutic reasons. [ 2 ]

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