equivalent focal length

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length, equivalent focal

In an optical system composed of more than one lens, it is the linear distance separating the principal focus from the corresponding principal point. It is usually the most important quantity in the specification of an optical system as in objectives, eyepieces, etc. See principal focus; equivalent power.

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8 IS USM lens has a 35mm equivalent focal length of 27-88mm and is compatible only with the EOS 30D, EOS 20D, EOS Digital Rebel XT and EOS Digital Rebel SLRs.

Canon's New EOS 30D Digital SLR and Two New Lenses Deliver Top-Tier ... by Business Wire

the equivalent focal length lenses for traditional 35 mm

Kodak CCD Image Sensor Powers First Olympus Digital-SLR Camera for ... by Business Wire

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