- extension lens
- extension lens,a lens that may be used in combination to increase its focal length.
Useful english dictionary. 2012.
extension lens
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Extension tube — The tube contains no optical elements; its sole purpose is to move the lens farther from the film or digital sensor. The farther away the lens is, the closer the focus, the greater the magnification, and also the greater the loss of light… … Wikipedia
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extension tube — Photog. any of a series of tubes of varying lengths placed between the lens and a camera body to facilitate closeup focusing. [1955 60] * * * … Universalium
extension tube — Photog. any of a series of tubes of varying lengths placed between the lens and a camera body to facilitate closeup focusing. [1955 60] … Useful english dictionary
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