I am starting to practice flash photography with my 40D and a 580EXII and Better Beamer. This morning I set the flash exposure compensation on the 40D to -2 (the FEC range on the 40D is only +/-2) and still had significant "overflash" (with ETTL mode and HiSync). How can you further reduce flash output?
An indirect way I found was to reduce the ISO. This effectively shortens the range of the flash. Thoughts?
As the BB increases the maximum reach of your flash by approx. 3 times, the closest possible distance is as well increased by 3 times. If you are very close to your subject, the BB might be to strong.
Hi John.
I am working on the BB at the moment, know what you mean.
I am exposing the 40D on manual and setting the 580ex flash to high speed sync, zoom at 50mm, flash compensation at minus 2 to minus 3. Camera exposure if exposing from the sky run at over comp between 1 and 1-2/3, if exposing from the grass run at under comp abt minus 2/3. Highly recommend Artie's CD. Arthur Morris, The art of bird photography 2.
Russell, how do you set the flash exposure compensation of the 40D to -3???? I do basically everything else the same (manual camera exposure & metering, HSS, zoom at 50 mm etc.) but to the best of my knowledge you can't expand the FEC on the 40D from +/-2. Do you set FEC on the 580EX flash? Thanks, JR
You set the external 580ex flash unit to -3, read page 14 in the manual for the flash unit, as a starting point. Then adjust the exposure comp in the 40D to minus or plus to suit for good exposure.
Get back to me if you have any queries.
Regards,
Russell
40D: Flash Exposure Compensation
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