Photographic term Reciprocity failure SWPPClick here to find out more

About us

Term - Reciprocity failure

Reciprocity failureSWPP Photographic Glossary

Sunday 4th October 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

Reciprocity failure

Reciprocity law states that as you increase the intensity of light reaching the film you also need to decrease the speed it reaches the film by the equivalent amount. Most films work quite happily between exposures of 1/2sec and 1/1000sec, but go beyond these extremes with a very low intensity of light and a long exposure or a very high intensity of light and a correspondingly short exposure and the law fails an exposure increase may be required when the shutter speed is beyond these limits. At these extremes the law fails. Compensation is required to adjust for this, but there is no strict rule to correct the error.


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 14:28:02