That's interesting about FP4. I'm itching to give this film a try. If so, I may not have to take too much of a hit in speed.
My film speed test target is about 6" in diameter cut in a largish sheet of plywood. I place a sheet of translucent white plastic against this and follow with a sheet of frosted glass 3/4" behind that. I illuminate this target from behind with two blue bulbs. I can change the intensity of the target by varying the distance between the bulbs and the target. (Or, by turning off one of the light bulbs.)
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