Well Diego, i suggest testing your film with edwal's FG7, i am about to do so myself using 4x5 sheet film. FG7 is a compensating developer which can be useful with film such as tech pan. I suggest you start your first test with a dilution of 1:31, 6 min at 20B0C exposing at about asa 25...just try it at different asa's by bracketing at one third increments then look at the final result on a contact sheet.(posted 8624 days ago)good luck, Daniel D. Canada