Quote Originally Posted by Michael Slade

I've never had much luck shooting TMax for getting much expansion. I have heard that Ilford films expand much better. (not to get on a tangent...).

Also I will not have access to any Pyro, so I figure I'll do a more 'traditional' developer.

I'd be afraid I'd be biting off more than I can chew tackling the 12x20 *and* Pyro. Whew!

I second and third Jorge's suggestion about TMAX 400. Used with Pyrocat you should get full film speed.

Purchase a box of 4x5 and make some tests. It will really pay off in the long run.