Well, I guess first it would be good to discuss some of Altman and Henn's findings - even though they are somewhat outdated in the specifics.

Your feedback on any of this would of course be of great value, Ralph. Hopefully we'll get some feedback from PE and others too.

What I'd really like to do is re-run a similar test with some current films. It's a lot of work but could be interesting to do. The problem I have is I don't have the equipment required to determine RMS granularity and make objective acutance measurements. At the very least one requires a microdensitometer.

Will post the summary today and see what happens.