My Viv 283 manual states sic "flash duration (approx)
1/1000 second (manual)
1/1000 to 1/30,000 second (automatic)"
Experiment reliability should trump the manual. I have seen GN for the 283
reported at about 1/2 of 120 (at least outdoors) ASA 100 and almost never 120
even inside. Might be worth an e-mail to Vivitar to see what's up.
Wonder what the GN of the T20 and 32 are outdoors.
Mike
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