Agreed, but I do not understand why it is happening.
For film the GN of a flashgun lowers for a ISO rating less that 100, and then, in manual setting, the distance and f# are determined - for that film speed.
This is exactly what I am doing for paper negatives. I 've assumed ISO6 for paper, therefore my flash's GN drops from 30 to 7.5.
At an aperture of f5.6 this gives a flash to subject distance of 1.34m. I set the speed to 1/60s and the lens on the X setting
Yet when I'm in the region of 1.5m to 2m from the subject I get a totally black image instead of an reasonably exposed image.
I'm obviously missing something and it is this I'm trying to determine.
Any and all help welcome
regards
Tony
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