Term - Equivalent focal length
|Equivalent focal length||SWPP Photographic Glossary|
Wednesday 20th September 2017
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
SWPP, 6 Bath St, Rhyl, LL18 3EB