Help - Pull Processing TMAX 400

[photophorous]

Happy Monday, everyone. I'm off to a great start.

I accidentally exposed a roll of TMAX 400 at 100 ISO. I usually shoot 100, and that's what my light meter was set for. I'm an idiot. What can I say.

Can anyone tell me how much I should alter the processing to compensate? I know I need to reduce development time, but I don't know how much. Should I develop at the recommended time for TMAX 100? Or, should I reduce development to somewhere between the recommendations for 400 and 100?

This problem has spurred another question: I've tinkered with altered development times before, but nothing this drastic. In researching this problem, just now, I read that TMAX is not good for push or pull processing. I'm trying to learn a little about the Zone System. Should I be using a different film?

I use D-76, if that matters. Any advice is appreciated.

Thanks,
Paul

[another view]

Have you seen the Massive Dev Chart? It does list this film at ISO200 with D76 but this would leave you one stop over over exposed. At 20 deg C (68 deg F) and a 1+3 dilution of the stock solution, they recommend 15 minutes if exposed at 400 and 12 minutes if exposed at 200. From this, maybe 10 minutes is a good guess for a development time.

Don't use the recommended time for T-Max 100. I didn't use T-Max films too much except for the 3200 which I never tried to develop myself. Tri-X can be pushed very easily; 400 and 800 are the same developing time IIRC. I've seen good results at 1600 but I think that was with HC110.

[photophorous]

AV, thanks for the advice. I have seen that site before, but I forgot all about it. I have it bookmarked now.

I developed the film last night, and it seems to have come out pretty good...considering. I developed for 10min & 30sec using D-76, 1:3 dilution...starting at 68 degrees. After a quick look through the loupe the tonal range seems decent at least...better than expected. I'll scan them tonight and post a few for examples.

Thanks again!

Paul

[another view]

Cool! Glad it worked out.