An experiment to compare a 400mm f/5.6 on a 60D vs. the same lens on a 6D with the 1.4X TC III (manual focus) ended up displaying a vastly different color balance. The 60D has much cooler (more blue) tones than the 6D with the TC and the same lens. I checked the Picture Style on both bodies. The 60D is on Standard (3,0,0,0) and the 6D is on Auto (3,0,0,0) which has the same values as Standard (3,0,0,0) I don't know what "auto" does vs. "standard" since the numbers are identical. I had to reduce the 6D files size in Photoshop to 60% so both files were 2.7 MB. I cannot imagine the 1.4X TC III is the cause of the tonal differences. I have never adjusted Picture Style settings on either body. Any suggestions as to what's going on here would be appreciated.