Pre-flashing?
Does anyone have any data from using a flash gun to pre-flash paper prior to exposure?
One of the flash guns I've got has a GN of 32 or 48 (dependant on hood setting) in metres at ISO 100.
The output power can be reduced to 1/16th power - Flash duration varies from 1/1000th s to 1/125,000th s
I realise there are a lots of if's, but's and maybe's - however I'd rather start with someone's proven data than just assume a random setting.
Also, there was an earlier mention of the paper's ISO rating after pre-flashing being increased by three stops.
All opinions and comments welcome
regards
Tony