Had my 7D and 70-200 f4 at the track a couple of times now and noticed that pretty much every shot of a black or dark coloured car turns out absolutely spot on and sharp as a tack but the lighter colours such as greens, yellows, whites, etc just don't seem to be anywhere near as good and consistant. I still get good shots but no where near the amount of keepers as I'd like. Is there something in the camera I can try changing?
Heres a couple of examples