Term - Equivalent focal length
|Equivalent focal length||SWPP and BPPA Photographic Glossary|
Tuesday 10th December 2013
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
SWPP & BPPA, 6 Bath St, Rhyl, LL18 3EB