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  2. Sigma 120-400mm f/4.5-5.6 DG OS HSM lens - Wikipedia

    en.wikipedia.org/.../4.5-5.6_DG_OS_HSM_lens

    The Sigma APO 120-400mm F4.5-5.6 DG OS HSM lens is a super-telephoto lens produced by Sigma Corporation. It contains three SLD (Special Low Dispersion) glass elements to provide correction for chromatic aberration. It is aimed toward advanced consumers.

  3. Optical landing system - Wikipedia

    en.wikipedia.org/wiki/Optical_landing_system

    The concave mirror, source light combination was replaced with a series of fresnel lenses. The Mk 6 Mod 3 FLOLS was tested in 1970 and had not changed much, except for when ship's heave was taken into account with an inertial stabilisation system. These systems are still in wide use on runways at US Naval Air Stations. [4]

  4. Visual approach slope indicator - Wikipedia

    en.wikipedia.org/wiki/Visual_approach_slope...

    The visual approach slope indicator (VASI) is a system of lights on the side of an airport runway threshold that provides visual descent guidance information during final approach. These lights may be visible from up to 8 kilometres (5.0 mi) during the day and up to 32 kilometres (20 mi) or more at night.

  5. Sigma 50-500mm f/4-6.3 DG lens - Wikipedia

    en.wikipedia.org/wiki/Sigma_50-500mm_f/4-6.3_DG_lens

    The Sigma 50-500mm f / 4-6.3 EX DG HSM is a super-telephoto zoom lens produced by Sigma Corporation. It contains four SLD (Special Low Dispersion) glass elements to provide correction for chromatic aberration.

  6. The Uncensored Library - Wikipedia

    en.wikipedia.org/wiki/The_Uncensored_Library

    An example of a readable book [b]. Each of the nine countries covered by the library, as well as Reporters without Borders, has an individual wing, containing a number of articles, [1] available in English and the original language the article was written in. [2] The texts within the library are contained in in-game book items, which can be opened and placed on stands to be read by multiple ...

  7. Lighting control console - Wikipedia

    en.wikipedia.org/wiki/Lighting_control_console

    Consoles vary in size and complexity, from small preset boards to dedicated moving light consoles. The purpose of all lighting consoles, however is the same: to consolidate control of the lights into an organized, easy-to-use system, so that the lighting designer can concentrate on producing a good show.

  8. Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM lens - Wikipedia

    en.wikipedia.org/wiki/Sigma_4.5mm_f/2.8_EX_DC...

    The Sigma 4.5mm f/2.8 EX DC circular fisheye is a photographic lens manufactured by Sigma Corporation. It is a circular fisheye lens , designed to project a 180-degree field of view in all directions onto a circular image.

  9. Digital Addressable Lighting Interface - Wikipedia

    en.wikipedia.org/wiki/Digital_Addressable...

    Digital Addressable Lighting Interface (DALI) is a trademark for network-based products that control lighting.The underlying technology was established by a consortium of lighting equipment manufacturers as a successor for 1-10 V/ 0–10 V lighting control systems, and as an open standard alternative to several proprietary protocols.