I have shot a roll of Tri-X (35mm) rated at 200 ISO. I need to develop it in Rodinal. I couldn't find information for this rating on the web. Can anybody suggest how many minutes I should develop it (at 20C?).
I recently tried this same thing. I wanted to try Rodinal for the first time since I purchased a bottle over a year ago and never opened it. I used unblinkingeye.com's suggestion of 7.5 min, 1:50 dilution at 75 F. I used two inversions, once per minute.
I'm sure I'll have to work on my technique but this is one of the photos from that roll:
I go 9-11 minutes at 1:50 for EI 250, depending on whether it was shot on a bright sunny day or a flat gray day.(9 for sunny, 11 for flat). I like a thinnish negative, though- and generally shoot for a grade 3 paper contrast on roll film. You should get plenty of shadow detail at that speed.
I think in the end the negatives were slightly too thin. I have an example in my gallery which seems ok, though: you can find it (there was a url link here which no longer exists).