Are you refering to EXIF data shown in pbase, or actual in camera
recording of EXIF?
It was explained in the discussion post "SI-A", that pbase has an issue
with that, inexplicably inserting a false negative with regard to flash
use. One of my submissions to that mandate was shot with my D300s +
SB-800, and while the EXIF data indicated that flash had been used on
all copies of that image file, the SI pbase version stated, "Flash
Used: No".
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Regards,
Savageduck