Film Reciprocity Chart

This chart can be used to calculate extended exposure times for reciprocity failure.


The attached chart has been sent to me via Andrew Sanderson who has been involved in film and darkroom printing for over 40 years. He has tested the times and found them to produce good printable negatives.

Note: The times indicated in the chart can be used for a variety of films according to Andrew with the exception of Fuji Acros. Fuji Acros hardly suffers from reciprocity failure and he suggests to only increase the exposure by 1/2 stop for times greater than 2 minutes.

From the times Andrew gave me, I have compiled the attached PDF which includes 2 identical charts, each sized to A5 so 2 charts can be printed onto a single sheet of A4 paper.