This was mentioned on another thread and I just thought of it, I don't know your camera but it was mentioned they with cameras that have leaf shutters, if you exceed the shutter speed, rather than see part of the frame completely black, you get a sort of underexposed center brighter image because the leaf shutter in the lens hasn't finished opening yet. Could this be what happened? Was the shutter speed too fast for the x-sync?
Originally Posted by karrlander
Just another thing to consider.
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