I have taken a series of HDR shots today using my 1D X and 24-105L lens. I have also used a tripod and the camera is set to auto bracketing (5 exposures). In just about every series of shots the very first picture has camera shake and the other 4 exposures are sharp. I was wondering if anyone else had this problem before and if it is possibly the Image Stabalizing motor causing the shake? What is strange is that it is for instance a 3 sec exposure that is shaky but the longer exposures are perfect... This is very confusing!