Response to PMK negative density

The only way to determine ISO (actually EI) is to test for the exposure that will produce 0.1>B+F. If you are using PMK, then you must use a color densitometer and use the blue channel. I have measured most films, and for what it's worth this is what I got. Pan- F, EI:32; FP-4+ (and Arista 125) EI:80; HP-5+ (Arista 400) EI:200; Delta 100, EI:100 (!); Delta 400 EI:250; TMX EI:64; TMY EI:320; +X EI:80 (has a weird blue B+F.) I hope some of you will find this information useful. BTW, I used a CALIBRATED Zone VI digital spot meter. Z6 has a surprisingly lax atitufe on calibration.

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