« on: May 22, 2013, 11:19:56 PM »
Most Cameras (even the T3i) allow you to set a shutter speed range when using flash - did you check the settings in the custom functions? Sounds like there is no limit set on your 5D3
This is his problem. Needs to change the custom setting in the camera menu to prevent shutter speeds below 1/60 in aperture priority mode. RTFM.