I want to shoot HDR on a 5D iii using 1/25 shutterspeed at 50 fps which should give me two nearly identical frames with 2 different iso settings. Is it possible to override shutter speed as far in ML? So far I only can get a bit over 360°. I tried 1/25 shutterspeed at 50 fps on a Sony and it worked well but I want Canon, ML, raw and HDR.