I've seen Delta 3200 @ 1600 in Perceptol looking relatively clean with a tight continuous grain structure.

You won't approach a high MTF% @ 80 lp/mm+ with such high speed film.

Quote Originally Posted by Gerald C Koch View Post
Rodinal is NOT a fine grain developer and hence is not recommended for fast films particularly when they are pushed. That is unless you are looking for coarse grain.
Semi-stand Rodinal is excellent for pushing, and gives good grain.