FP4 in Rodinal is a great combination if you are not trying to create extreme enlargements. You don't say what your film size is, but I get great results with 6x7cm film enlarged to 11x14 inches. It will be sharper than D76, but you may or may not notice any difference.(posted 8406 days ago)For bright sunlit scenes, try Rodinal at 1:75 dilution. For less contrasty scenes, try 1:50 or 1:25 dilutions.