Term - Relative aperture
|Relative aperture||SWPP and BPPA Photographic Glossary|
Thursday 24th April 2014
The measurable diameter of the diaphragm divided by the focal length of the lens in use and expressed in terms of "f" numbers, marked on the lens barrel.
Information provided by: SWPP BPPA
SWPP & BPPA, 6 Bath St, Rhyl, LL18 3EB