I have gotten great results with pan-f(E.I.25) using rodinal 1:100 for 20min.I agitate for the first full min. and then every 3min. It gives excellent sharpness, shadow detail and the highlights will not block up.I have used higher dilutions on other films and the negatives ended very soft,yet fully developed;but 1:100 is my favorite(posted 9383 days ago)