Been struggling with getting low shutter speed shots with the 5DSR (for obvious reasons) during rolling shots. Today I forced myself to shoot at 1/40 or lower...hit rate was terrible but the shots that came in sharp had beautiful blur with the hi resolution.
Make sure IS is on. Also you really don't need to go over 35mph to get good movement... even shooting at 1/60th or even 1/80th
Yea I had it on....no idea why I didn't use auto ISO sooner tbh. We did a few passes at 1/60 to 1/80 but I was trying to get that "rig look".
I think you nailed it right! great job.