APUG - View Single Post - Developer Temperature Compensation Formula

Lee L · 07-15-2008, 01:10 PM

There's another recent thread on this is at: http://www.apug.org/forums/forum37/5...sate-temp.html

I posted a .pdf chart there for D-76 time vs temp data from Kodak for multiple films. I've seen some formulae posted by Michael Covington and by others here on APUG, and also ran a regression recently to find out what made the Kodak Darkroom Dataguide development time vs temp wheel work. I got formulae, but if you look at the various specific manufacturer's time vs temp charts, you'll find that the formulae and curves found lying around are mostly generic, and designed to be close for most films and developers, and are probably close to exactly correct in a few cases.

P.E. and others have the answer, there's not a single answer/formula for all films or all developers.

Lee

07-15-2008, 01:10 PM	#5 (permalink)
Lee L Join Date: Nov 2004 Posts: 1,942	There's another recent thread on this is at: http://www.apug.org/forums/forum37/5...sate-temp.html I posted a .pdf chart there for D-76 time vs temp data from Kodak for multiple films. I've seen some formulae posted by Michael Covington and by others here on APUG, and also ran a regression recently to find out what made the Kodak Darkroom Dataguide development time vs temp wheel work. I got formulae, but if you look at the various specific manufacturer's time vs temp charts, you'll find that the formulae and curves found lying around are mostly generic, and designed to be close for most films and developers, and are probably close to exactly correct in a few cases. P.E. and others have the answer, there's not a single answer/formula for all films or all developers. Lee