Term - Entrance pupil
|Entrance pupil||SWPP and BPPA Photographic Glossary|
Friday 20th December 2013
A size of the beam of light which, entering the elements of a compound lens that are in front of the aperture, completely fills the iris diaphragm.
Information provided by: SWPP BPPA
SWPP & BPPA, 6 Bath St, Rhyl, LL18 3EB