focal length

(redirected from Effective focal length)
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Synonyms for focal length

the distance from a lens to its focus

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References in periodicals archive ?
Digital sensors are currently smaller than the area of a 35mm image, so the effective focal lengths of lenses are increased by about 50% when attached to a digital camera.
The system is fully motorised with microprocessor control, and the lens offers parfocal selection of five effective focal lengths, four selectable filters and a four-line backlit display of focal length, filter position, focus range and operating status.
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