Call me an idiot...forgot ISO...

[mps]

Okay, I feel really stupid here. I recently shot a couple rolls of HP5+. Well I shot one at 400 and the other at 1600.....and guess what, yes I forgot to mark the one exposed at 1600! Would it be best to process them both at 400? Any suggestions? And I feel even more stupid after writing this question! Thanks in advance!

 

[JBrunner]

Which of the two rolls is most important? If they are equally important proccess the first roll for 1600, if you luck out, great, if not, its over two stops, not a total disaster, and you know what to do with the second, or vice versa(if you luck out, its 50/50). If the 400 is important, process one at 400, if you luck out, great, if not, you know what the second roll is, and you will have to take your lumps on the first.

 

[Richard Wasserman]

I don't really know what to suggest about processing the film, although JBrunner's question is a good one. Please don't feel too stupid, this is just one of the more popular mistakes to make. The entire list of errors is very, very long and growing.

Richard Wasserman

 

[mps]

Which of the two rolls is most important?

The one shot at 1600 but was hoping to be able to get prints from both.

 

[reellis67]

You could clip the first bit of film from one roll and develop it normaly to see if it is the 400 or 1600 roll. You will likely cut through a frame, but at least you would know for the rest of the roll...

- Randy

 

[JBrunner]

The one shot at 1600 but was hoping to be able to get prints from both.

Then process one for 1600, and you should have a decent chance to pull prints from the 400 roll if you are unlucky, and thats the first roll you process. If you win, then you win, and if you lose, all is not lost. Underprocessing the 1600 would be the clear loser, because you can't print what's not there.

 

[JBrunner]

You could clip the first bit of film from one roll and develop it normaly to see if it is the 400 or 1600 roll. You will likely cut through a frame, but at least you would know for the rest of the roll...

- Randy

A good suggestion, that I didn't think of. (I don't think in roll film reality that much)

 

[Dave Parker]

A clip test is going to be your best bet, your most likely going to loose a frame or two off of each roll, but it is your best chance to figure out which roll was shot at what ISO.

Dave

 

[kb244]

I wonder how catastropic it would be to develop both as 800?

 

[reellis67]

I'd only do one with any method because you will know what the other is after the first is out of the fixer...

- Randy

 

[mps]

I wonder how catastropic it would be to develop both as 800?

That was my first thought, processing the first roll at 800 and then going from there. My fear was if it was the 1600 roll then would it still be too underdeveloped to print from? Anyone have an experience with this?

But the suggestion of only processing the first few frames is the way to go......need not rush things....

Thanks for the help! Mistakes = learning...I hope it sticks!

 

[kb244]

I don't really know what to suggest about processing the film, although JBrunner's question is a good one. Please don't feel too stupid, this is just one of the more popular mistakes to make. The entire list of errors is very, very long and growing.

Richard Wasserman

If you are an experience darkroom tech or whatever one would call it, and have never made a mistake. Then one can say you would not be very experienced lol. (that is to say you haven't done it long enough if you have not made even the simplest of errors, I think its true for most things)

 

[Ole]

I would do the same as I do when I've exposed a roll in wildly variable lighting conditions without a light meter:

Stand development in FX-2.

FX-2 gives a real speed increase of 1 to 1 1/2 stops (with FP4+, I expect about the same with HP5+), and the stand development helps to compress the high values so that they don't block up.