Funny, I posted a reply and it shows that I did with my name, but no reply seems to have been entered. Well, here goes again.................What was your cameras shutter speed set at? When using a leaf shutter lens I set my camera shutter, not the lenses leaf shutter, to 1/8th sec.. If you have it set too high you get your follower cutain trap by the flash. If you have the cameras shutter set low, like 1/8th sec., then it could be a dragging first curtain maybe. JohnW