Term - Equivalent focal length
|Equivalent focal length||SWPP and BPPA Photographic Glossary|
Sunday 23rd November 2014
Equivalent focal length
A distance in a lens between the front nodal point and the focal plane when the lens is set to focus a subject at infinity. In a telephoto lens the equivalent focal length is shorter than the back focus. The reverse is true in a wide angle lens.
Information provided by: SWPP BPPA
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