If you remember this post about reversal processing images taken on photo paper (enlarging paper) in-camera, then this might be of some interest. I have done some more experimenting. At first, I made the terrible mistake of changing too many variables at once. I was trying different papers and rushing through the processing procedure and the results were all bad. In order to understand a process like this, you have to isolate a variable and just change that incrementally so that you can see what effect that variable has on the end product. So I decided to just use one paper (Arista Grade 2), one camera (Graflex Speed Graphic with the Graflex Optar 135mm lens), and one dev/reversal process (outlined in the aforementioned post). So I took 4 shots of a high-ish contrast subject. I only varied the exposure. I used iso ratings of 0.25, 0.5, 0.75 and 1.0. I know those seem like extremely low ratings, but it turns out they are in the right ballpark. I started here based on some vlogs by Joe Van Cleave as well as some initial Googling and experimentation. Anyway, I wanted to share my results, so here goes.
These are in order of low to high iso rating. The subject is a scooter and a padlock against a brown fence in direct sun. The exposures were all done at f/16 and the times were 4, 2, 1.5 and 1 second respectively.
I can tell very little difference between the last two, but they both look about right. They might tolerate a bit less exposure, but for a regular scene with more mid-tones, I think iso 1 will do nicely. So here's what I think I am learning about this process. Expose more than you think you should. Develop to completion on both dev steps. Stop and wash completely! Keep the bleach fresh (I make 300 mL and discard after 4 sheets). If you have bleached adequately, you don't need to restrain the second exposure. I am using bright bathroom lighting for 2 minutes.
Now the next step will be to make exposures in my Ansco 3A and get some postcard format pictures out that I can send to my analog photo friends. I might even try tank developing those and see what happens. If you are doing reversal processing, drop me a comment and let me know how it's going.
