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  2. Lens cover - Wikipedia

    en.wikipedia.org/wiki/Lens_cover

    Canon lens covers. Screw-in metal lens cap A Nikon LC-52 Snap on Front Lens Cap (back side) The lens cover as seen on a Sony Ericsson K810i. A lens cover or lens cap provides protection from scratches and minor collisions for camera and camcorder lenses. Lens covers come standard with most cameras and lenses.

  3. Binoculars - Wikipedia

    en.wikipedia.org/wiki/Binoculars

    8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.

  4. M42 lens mount - Wikipedia

    en.wikipedia.org/wiki/M42_lens_mount

    The M42 lens mount is a screw thread mounting standard for attaching lenses to 35 mm cameras, primarily single-lens reflex models. It is more accurately known as the M42 × 1 mm standard, which means that it is a metric screw thread of 42 mm diameter and 1 mm thread pitch.

  5. Lens mount - Wikipedia

    en.wikipedia.org/wiki/Lens_mount

    Lens mounts of competing manufacturers (Sony, Nikon, Canon, Contax/Yashica, Pentax, etc.) are almost always incompatible. In addition to the mechanical and electrical interface variations, the flange focal distance from the lens mount to the film or sensor can also be different.

  6. Objective (optics) - Wikipedia

    en.wikipedia.org/wiki/Objective_(optics)

    Objective lenses of binoculars. In optical engineering, an objective is an optical element that gathers light from an object being observed and focuses the light rays from it to produce a real image of the object. Objectives can be a single lens or mirror, or combinations of several optical elements.

  7. Nikon - Wikipedia

    en.wikipedia.org/wiki/Nikon

    The Nikon F-mount is a type of interchangeable lens mount developed by Nikon for its 35 mm Single-lens reflex cameras. The F-mount was first introduced on the Nikon F camera in 1959. See Nikon F-mount → Nikkor; Lenses with integrated motors: List of Nikon F-mount lenses with integrated autofocus motors

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