Don Westergren's Test Results For Print Films

Updated 2002 May 21

As some of you may know, Don Westergren has been carrying out an exhaustive series of tests of sensitivity, reciprocity failure, and color balance vs exposure time (ie, color-dependent reciprocity failure). 

I'm happy to report that Don has his own site up and running now. It's at:

Don's method is an extension of Robert Reeves' work of several years ago (and the earlier Wallis & Provin work), using a test box with R, G, and B LEDs and exposing film for progressively longer times while reducing the intensity to maintain equivalent total exposure. His exposure times range from 1 second to 1,2 or even 4 hours! A great piece of work!

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