back lens
1Lens (optics) — For other uses, see Lens. A lens. Lenses can be used to focus light. A lens is an optical device with perfect or approximate axial symmetry which tra …
2Lens mount — A lens mount is an interface mechanical and often also electrical between a photographic camera body and a lens. It is confined to cameras where the body allows interchangeable lenses, most usually the single lens reflex type or any movie camera… …
3lens — 01. The [lens] fell out of my new sunglasses, so I got my money back. 02. Nowadays, many people with poor eyesight can have their vision restored through corrective [lens] surgery using a laser beam. 03. I scratched the [lens] of my sunglasses… …
4Lens — The transparent structure inside the eye that focuses light rays onto the retina (the nerve layer that lines the back of the eye, senses light and creates impulses that go through the optic nerve to the brain). The lens was named after the lentil …
5Lens, intraocular — The clouded (cataractous) lens is best removed in its entirety by surgery and replaced with an intraocular lens (IOL) made of plastic, an operation that takes about an hour and usually does not need hospitalization. Cataract surgery was first… …
6back focus — Photog. the distance between the back surface of a lens and the focal plane when the lens is focused at infinity. [1895 1900] * * * …
7Back River Light — Infobox Lighthouse caption = Undated photograph of Back River Light, Virginia (USCG) location = convert|1|nmi|km|abbr=on south of the mouth of the Back River on the western shore of the Chesapeake Bay coordinates =… …
8back focus — noun : the distance from the rear glass surface of a photographic lens to the focal plane when the lens is focused on a very distant object …
9Corrective lens — A bifocal corrective eyeglass lens A pair of contact le …
10History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …
