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2. Lens cover - Wikipedia

   en.wikipedia.org/wiki/Lens_cover

   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. Some mobile camera phones include lens covers, such as the Sony Ericsson W800, the Sony Ericsson K750 and the Sony Ericsson K550. A more secure lens cap is the metal screw-in ...

3. Optical coating - Wikipedia

   en.wikipedia.org/wiki/Optical_coating

   One type of optical coating is an anti-reflective coating, which reduces unwanted reflections from surfaces, and is commonly used on spectacle and camera lenses. Another type is the high-reflector coating , which can be used to produce mirrors that reflect greater than 99.99% of the light that falls on them.

4. Active camouflage - Wikipedia

   en.wikipedia.org/wiki/Active_camouflage

   Camouflage is weakened by motion, but active camouflage could still make moving targets more difficult to see. However, active camouflage works best in one direction at a time, requiring knowledge of the relative positions of the observer and the concealed object. [1] An invisibility cloak using active camouflage by Susumu Tachi. Left: The ...

5. Sniper equipment - Wikipedia

   en.wikipedia.org/wiki/Sniper_equipment

   The M40A3, a bolt-action sniper rifle used by the United States Marine Corps.Introduced in 1966, the M40 was built up from a Remington 700 bolt-action rifle.. The major components of sniper equipment are the precision sniper rifle, various optical scopes and field glasses, specialized ammunition and camouflage materials for the sniper’s body and equipment.

6. Lens hood - Wikipedia

   en.wikipedia.org/wiki/Lens_hood

   Lens hoods may also be used to protect the lens from scratches and the elements without having to put on a lens cover. The geometry of a lens hood is dependent on three parameters: the focal length of the lens, the size of the front lens element and the dimensions of the image sensor or film in the camera.

7. Camera lens - Wikipedia

   en.wikipedia.org/wiki/Camera_lens

   Different kinds of camera lenses, including wide angle, telephoto and speciality. A camera lens (also known as photographic lens or photographic objective) is an optical lens or assembly of lenses (compound lens) used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.