Superb 1# 4# and 6# for me.
Silly question time if you dont mind ...........
Do you use a CPL filter on some of your shots?
I know it creates some strange effects on perspex screens used in some of the cars but i used one on a 70-200 the other day at Brands and it worked a treat,so much so that i have just orderd a drop in one for my 300 f2.8.