Technology / Television (TV) / Zoom Lens (Variable Focal Length): A lens with a variable focal length, allowing the operator to shift immediately and continuously from wide angle to telephoto (or vice versa) without switching lenses.
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Focal Noun Synonyms: central, focused, concentrated, convergent, centred, centralized
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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
Technology / Digital Cameras / Optical Zoom: The ability to magnify a subject for close-ups, by adjusting the camera's lens assembly (thus the name 'optical'). Most current digital cameras include an optical zoom lens of some kind. The amount of MORE
Entertainment / Photography / Normal Lens: Describes a lens with a focal length approximately equal to the diagonal of the film format for which it is being used. MORE
Entertainment / Photography / Portrait Lens: Lenses produced specifically for portraiture. They usually have a long focal length and produce a slightly diffused image. MORE
Entertainment / Photography / Positive Lens: Simple lens that causes light rays from a subject to converge to a point. MORE
Entertainment / Photography / Single Lens Reflex (SLR): Stands for single lens reflex. It is a camera of 35mm or medium format in which a system of mirrors shows the user the image precisely as the lens renders it. MORE