Full disclosure: this is my first time I pushed film. Plus there’s zero information on pushing Bergger and no timings given for Rodinal, so setup your expectations 🙂
When I’ve got two rolls of this film I decided to shoot the first one at the box speed and push the second one. Bergger provides timing for Rodinal developer for the box speed only, but if you want to push it you should either use Bergger Berspeed, which is probably a good idea, or you can do your best guess.
Since I didn’t have Berspeed I decided to make an ‘educated’ guess. I estimated the temperature to time curve for both Rodinal and Berspeed and noticed that Rodinal has a steeper curve.
That means that development time for 1600 iso should also somehow fall into this rule. Then I decided that agitating for 25-30 min is too much and I went with 1+25 dilution. Having this knowledge I checked my crystal ball and Tarot cards and came up with the following timing:
To get +2 stops I should develop in 1+25 dilution at 24ºC for 10 minutes.
I can’t say that results are totally off, but there’s a development error for sure and metering errors on top of that. Nevertheless, results are more than usable. I’ve found that I’ve gotten better shots when I intentionally overexposed the scene at least a half a stop, which is a way to go when you unsure with almost any film.
Will I ever push Pancro 400 again? Definitely yes. Develop in Rodinal? Most probably not. But for those of you who have much more experience that could be a starting point to figure the correct timing.