Same roll (FP4+) exposed at both EI 50 and EI200 - development?

I recently put a FP4+ film in one of my cameras an decided to expose it at EI50. Mid-roll, I forgot about the camera for a while and when I took it back in service my memory failed my and I was certain I had HP5+ in it and exposed the remaining frames at EI200. How to develop? I have been thinking about using a two-bath developer, would that be any good? I have been experimenting with Thorntons two-bath developer in the past, but do not know how good it is at pushing?

Suggestions anyone?

(Not that the roll is extremely important to me, but it would be nice to at least get something out of it.)

Best regards
Henrik

The 2/3 of a stop underexposure isn't exactly a disaster. I'd favour a developer that would give full film speed and develop normally. Xtol would be my choice.

Two-bath developer may be one good choice.
Another possibility would be to think about which pictures are more important for you: Those from the first part of the roll, or those from the second part?
Depending on that you could make a choice and set a priority.

As mentioned, that's really not enough of a difference in EI to make a difference. I'd just develop it normally. Should be just fine, as that particular film shouldn't be that fussy about a small change in EI.

momus said:

As mentioned, that's really not enough of a difference in EI to make a difference. I'd just develop it normally. Should be just fine, as that particular film shouldn't be that fussy about a small change in EI.

Click to expand...

+1. If you really want to, develop it per Ilford's time for pushing one stop. I wouldn't worry about the frames you exposed at EI 50. They'll be a little dense, but otherwise fine.

The difference between EI 50 and EI 200 is 2 stops. Develop for EI 50 and you'll lose shadow detail for the shots exposed at EI 200. Or develop for EI 200 and deal with dense highlights for the EI 50 exposure. Maybe the best choice is to split the difference.

You could always cut the roll in half. Then push and pull 1 stop in times, or stand the 50 and diafine the 200.

Thanks all for your input!

I decided to split the difference and develop the roll as if it was exposed at EI 100 (xtol 1+2). It seems to have worked well and all frames seems to be printable; no lost shadows nor any blocked up highlights.

Regards
Henrik