Jeremy:

http://www.ktphotonics.co.uk/pdf/FstopTiming.pdf

http://www.photo.net/bboard/q-and-a-...?msg_id=004lft

Here are two links I found today on the subject of f stop printing. The first is an excerpt from 'Way Beyond Monochrome' and the second is a thread from photo.net. You can also find a program for your computer at http://www.bonavolta.ch/hobby/en/photo/labsoft.htm but I havn't tried it yet. If you find anything else in this subject area let me know. Thanks!