I recently was given a bulk loader with quite a lot of unknown film in it. The guy who gave it to me, says it's about 20 years old. As a first test, i shot a small piece of film at 100 iso, and i stand developed it in Rodinal 1:100. The film turned out to be Tri-X 400. Of course, base fog is tremendous, and the images are a bit overexposed. I now want to improve the results a bit. I'm thinking of shooting at 200, but how can i develop it best? Shoot at 200, develop for the time indicated for 400, or shoot and develop for 200? I'll be using Rodinal to develop. I know it's not ideal, but i'm just getting the hang of controlling contrast with agitation and dilution.