I was wondering if anyone else has run into this issue? I have a 135 Xenotar in a Compur, but when I use a longer shutter speed it triggers my strobe twice. I've tested this with both a sync cord and a Pocket Wizard and the behavior is consitent, no problems with flash bulbs though, HA! I had this one CLA'ed within the last year or so and the shutter speeds are good though. Any info appreciated!