Term - f numbers
|f numbers||SWPP Photographic Glossary|
Monday 19th November 2018
e numbers on the lens barrel indicating the size of the aperture relative to the focal length of the lens. f numbers are calculated by dividing the focal length of the lens by the effective diameter of the aperture.
Information provided by: SWPP
SWPP, 6 Bath St, Rhyl, LL18 3EB