Term - Effective aperture
|Effective aperture||SWPP and BPPA Photographic Glossary|
Saturday 30th August 2014
A diameter of the bundle of light rays striking the first lens element that actually pass through the lens at any given diaphragm setting.
Information provided by: SWPP BPPA
SWPP & BPPA, 6 Bath St, Rhyl, LL18 3EB