Hi Jan, I'm not sure whether this is the best way to proceed due to the different compositions and characteristics of the developers. Have you tried developing Neopan 1600 in Rodinal? You should get plenty of "bite" especially at 1+25 or 1+50. I would also recommend TMax Developer for this film, alt...

Try 10 minutes. It should work out, or be very close. Any time you use is only a starting point, so test any time that seems right and take it from there.

If you are looking to make something like Liquid Light, then this page might be useful: http://www.duke.edu/%7Ejmw22/photogchem/ Alternatively, you could make an emulsion that is sensitive to UV light for use with gum bichromate, cyanotype, kallitype, salt printing etc... for more information look i...

21 DIN is equivalent to 100 ASA/ISO. DIN stands for Deutsche Industrie Norm and is an older European standard which may still be in use, but should have been superceded by the ISO standard. If the film is very old, then it will almost certainly be useless. If it has been exposed the best you can exp...