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  2. 1P78 Kashtan - Wikipedia

    en.wikipedia.org/wiki/1P78_Kashtan

    The 1P78 is mounted by means of the standard side rail found in other Soviet and Russian weapons designated with the -N suffix. The sight is centered over the bore of the weapon. It has an adjustable lens cap that can rotate freely that incorporates a spring-loaded detent that keeps it from moving around. The use of the 1P78 blocks the iron ...

  3. Lens cover - Wikipedia

    en.wikipedia.org/wiki/Lens_cover

    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 lens cap which cannot pop off a lens accidentally.

  4. Adjustable-focus eyeglasses - Wikipedia

    en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

    Distance vision corrections are made by re-adjusting the lens for distance, instead of by tilting and/or rotating the head to view object through the best part of the lens for the distance. Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi ...

  5. Telescopic sight - Wikipedia

    en.wikipedia.org/wiki/Telescopic_sight

    These models are often called adjustable objective (AO or A/O for short) models. Occasionally, a side-focus design (see below) might be used with a fixed reticle within the eyepiece, onto which the second focal plane (SFP) of the target image is shifted by an adjustable erector lens group. While side focus designs are generally considered more ...

  6. History of photographic lens design - Wikipedia

    en.wikipedia.org/wiki/History_of_photographic...

    [1]: 12 Aperture control gained more significance, and adjustable stops became a standard lens feature. The iris diaphragm made its appearance as an adjustable lens stop in the 1880s, and it became the standard adjustable stop about 1900. The iris diaphragm had been common in early nineteenth century cameras obscura, and Niépce used one in at ...

  7. Intraocular lens - Wikipedia

    en.wikipedia.org/wiki/Intraocular_lens

    This is by far the most common type of implanted lens after cataract surgery, as this is the natural and optimum position for a lens. [citation needed] Anterior chamber IOL (ACIOL). A less-common type of intraocular lens, which is sometimes used if a PCIOL is not an option for a patient or if the situation requires a phakic IOL (PIOL ...

  8. This under-sink organizer is more than half-off at Walmart ...

    www.aol.com/lifestyle/this-under-sink-organizer...

    Adjustable shelves are convenient. Reviewers are in agreement that the adjustability of the shelves adds a great deal of value to this two-pack of organizers. They love that they can be shifted to ...

  9. Lens hood - Wikipedia

    en.wikipedia.org/wiki/Lens_hood

    In photography, a lens hood or lens shade is a device used on the front end of a lens to block the Sun or other light source(s) to prevent glare and lens flare. [1] Lens hoods may also be used to protect the lens from scratches and the elements without having to put on a lens cover .

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