I have no idea why but don't think I'd be concerned, I'd just avoid EFC
when using flash. I don't think re-introducing shutter shock is likely
to be detrimental to a flash picture. Regardless of the shutter speed
the flash exposure will likely be much faster than the shutter and not
record the shutter vibration. The ambient exposure of the background
will be much less important and, I suspect, not bothered by the shutter
shock in any material way.
A flash exposure using an E-M5 with anti-shock turned off could probably
answer the question but I don't feel like experimenting... too many
variables of shutter speed, flash exposure duration and ambient light
exposure.
Dr. Flash
On 2/7/2015 11:27 PM, Mike Gordon via olympus wrote:
Just a couple other things. I think I mentioned that the Flash sync
speed with EFC is 1/20 sec and "not recommended." Hmmm, what's with
that?
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