Superpan 200 push problem

[Orio]

OK, I goofed. I forgot to set AE on my Zeiss Ikon and so I shot a whole roll of Rollei Superpan 200 at the very unlikely speed of 1/2000
I would normally just trash the roll, but I was in Pisa and I took what I expect to be some decent snaps, so I really need to save the roll.
Therefore I need to push it two stops (to ISO 800) in order to get something useable out of it.
The problem is that the Massive Development Chart does not list ISO 800 push times for the Superpan 200, except for the Diafine developer which I don't have.
So the question is: how would you figure a 2 stop increment developing time starting from the recommended times for nominal speed?
Do you have any suggestion? Do you think that a stand development could do good in this case?
I am hesitant using Rodinal because pushing a film two stops already brings up grain, and Rodinal is bad when there's a grain issue.
The other developers I have are Kodak T-Max, Ornano Gradual ST 20 and Ornano Fino S31 which is a compensating developer.
Unfortunately, the MDC does not list any time for these three developers.
Obviously, I can't just experiment in this case. I need to use a way that is safe enough to "take home" the roll even if it won't be top quality.

[Katastrofo]

I would try Rodinal 1:100 (start out at 18C) stand for 2 hours. Invert 2-3 times at the one hour mark.

If using Paterson tank, go with 400ml solution.

Diafine would have been the best bet, but I am no longer a big fan of Diafine.

[Orio]

Thanks for the suggestion Bill!
I never tried stand development before, what should I expect, less contrast?
Would you recommend keeping the tank into 18° water if the room temp is significantly lower?

I have read somewhere that Superpan 200 is the same film as Aviphot 200, if that's really the case
then I have a time for a push dev in Tmax, here:
http://www.digitaltruth.com/devchart.php?Film=Aviphot&Developer=&mdc=Search
10 minutes seem little for a 2 stops dev to me, but TMax is an energetic developer, maybe 10 mins are ok.

[Katastrofo]

Silly me, didn't see that you had TMAX dev. Yes, that does seem short (and not at a higher temp, too) but as you
say, it's an energetic developer. I would definitely try that over Rodinal, yepper.

[ForenSeil]

Superpan 200 is hard to push. I tried to push it Rodinal and never had success.
Actually even ISO200 is a little bit complaisant.

I would simply buy some Diafine (or use another more speed enhancing developer)

TMax developer is grainy but speed enhancing, if you don't wan't to buy another devoloper I would also try it before Rodinal.

[Orio]

Well, I tried TMax finally, 10 minutes at 21° temperature (the chart said 20° but I figured it didn't make much difference).
In fact, about half of the roll was salvaged ok. The other half instead remained nearly undeveloped, I guess that it would have
required a lot more developing time.
So after all I'd archive it as a successful rescue experience, although next time (which I hope does not happen) I'd more
likely use something like 11 minutes, or 10 minutes with 24° water, which in general TMax seems to appreciate much more
than 20°...
Obviously I'll post results when possible.

[Katastrofo]

Half is better than nothing, looking forward to seeing these.

[Orio]

[Orio]

Samples are there: http://forum.mflenses.com/viewtopic,p,1268433.html#1268433