One way around this problem is to use a 2 bath developer, Diafine in my case. Then all you need to do is some bracketing to determine your EI. Diafine works ok with IR films, but I have stopped using Konica 750 due to widely varying fog levels. MACO and HIE don't seem to have these fogging problems. Maco and Konica are pretty much alike, except for their response to 720nm and 25A filters.(posted 8543 days ago)