Reciprocity failure and Arista APHS Lithographic film

[jacques]

Hi,
This weekend I have a chance to take some picture and it will be my only chance because it is far from my house and I want to use Arista APHS Lithographic film with my pinhole camera. I am going to use ISO 6, I will be outdoor and it is suppose to be sunny. I was wondering if someone could give me some advice with the reciprocity failure of that film. I imagine that before apply the reciprocity failure time I will have a 2 minutes exposure. Do you think I should double the exposure or give more? Thank you Jacques

 

[Nicholas Lindan]

Go out and take some trial pictures today and see what turns out.

 

[pgomena]

Lithographic films tend to exhibit very little reciprocity failure. Also very little latitude. You either hit the exposure or you don't. I'd follow Nicholas' advice and give it a quick test before you take it on a trip. In any pinhole exposure, it usually doesn't hurt to give a little extra light to the film. With a 2 minute exposure, giving an extra 20-30 seconds will never hurt. It's less than about 1/3 stop!

Peter Gomena