Canon T2i/550D Sync, 1/320 sec !

Started Dec 12, 2010 | Discussions thread
Dan Finnerty
Contributing MemberPosts: 884
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Re: Canon T2i/550D Sync, 1/320 sec !
In reply to Roonal_Z, Dec 16, 2010

I suspect it is margin for ETTL/variable flash duration. The test case the OP chose was a very bright (white) subject near to the camera. A darker and/or more distant subject would have required more flash power, hence longer flash duration.
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Dan

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