pushing 400tmax

[Rolleistef]

Hello,
I used a 400tmax film at 800 and 'm now looking for processing times with Rodinal (well Fomadon F09 but it's just the same), for Digital Truth's Dev Chart only indicates times from 160 to 400iso.
Has somebody ever tried that, and knows about those times?
thanx

 

[Rolleistef]

it's all right, I finally found it. If somebody's trying the same, use Rodinal at a 1+25 dilution and 10.5 minutes.
http://www.mat.uc.pt/~rps/photos/FAQ_bw.txt
cheers

 

[darin3200]

If you can't find specific data a general rule is to increase development time by 30% for each stop pushed.

 

[Rolleistef]

is it an universal rule? If so, it's damn convenient!!
Thanx a lot!
The force be with you

 

[darin3200]

From what I've tried it seems to work. But if the development time is 10 minutes and you are pushing two stops it isn't 16 minutes. Its 10 increased to 13 minutes. Then you increase 13 minutes by 30% so its 16.9 minutes.

 

[Hertz van Rental]

If you can't find specific data a general rule is to increase development time by 30% for each stop pushed.

20% actually