Term - Relative aperture
|Relative aperture||SWPP Photographic Glossary|
Tuesday 9th February 2016
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
SWPP, 6 Bath St, Rhyl, LL18 3EB