The last reliable test data I have for Pan F Plus is from over a decade ago, taken from Robert Reeves' book on wide field astrophotography. He got a Schwarzschild factor of 0.76 for the film in testing.
I'll attach a .pdf chart of the adjusted exposure times for metered times out to 16 minutes, which you can use as a starting point. These are calculated with the standard Covington modified Schwarzchild formula, which you can find in several other posts on APUG.
P.S. Came back and added a graph of Reeves' findings for Pan F Plus in case you like that kind of thing. Both axes logarithmic.
Originally Posted by grantlyd
Last edited by Lee L; 05-03-2013 at 12:25 AM. Click to view previous post history.