Lens Hood

Entertainment / Photography / Lens Hood: Opaque tube, either cylindrical, square of funnel shaped, use to shield a lens from stray light outside the field of view.
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Positive Lens

Entertainment / Photography / Positive Lens: Simple lens that causes light rays from a subject to converge to a point. MORE

Portrait Lens

Entertainment / Photography / Portrait Lens: Lenses produced specifically for portraiture. They usually have a long focal length and produce a slightly diffused image. MORE

Petzval Lens

Entertainment / Photography / Petzval Lens: Early lens system developed by joseph petzval. It had a very wide aperture and was relatively free from aberration. Many modern lenses have developed from this simple three-element design. MORE

Process Lens

Entertainment / Photography / Process Lens: Lens system designed specifically for high quality copying. MORE

Reflex Lens

Entertainment / Photography / Reflex Lens: Alternative term for mirror lens. MORE

Single-Lens Reflex (SLR)

Technology / Digital Cameras / Single-Lens Reflex (SLR): An SLR, or single-lens reflex, camera is named for its picture-taking mechanism. In a film SLR, the viewfinder uses a 45°-angled mirror to see through the lens; that mirror snaps out of sight quickly MORE