Photographic term Guide number SWPPOff-Camera Lighting & Posing for the LifeStyle Family Portrait

About us

Term - Guide number

Guide numberSWPP Photographic Glossary

Tuesday 1st December 2015  



The Annual Convention
with a huge list of
cutting edge speakers from
4 continents.

Image Competition
Free entry for SWPP members.

Free Information Pack

Qualifications - An Overview

Guide number

Indicates the output, or power, of an electronic flash. You can use the guide number to work out the aperture or flash to subject distance by dividing either into the guide number. A photo term sometimes used to describe a flash factor, which provides a guide to correct exposure when using flash.


Information provided by: SWPP
More Photographic Terms

SWPP, 6 Bath St, Rhyl, LL18 3EB
Tel  01745 356935
International code (44)
07973 177079 or 07973 110526
Copyright 2006-12 SWPP. All rights reserved. - 13/03/2015 14:27:48