Only asking because no one here that I know of has mentioned this as an issue. Just noticed diglloyd posted this today as an issue he has run across. Do not know why, but often his issues come from extreme processing. Here he uses ACR,and noticed this at 200%. He used a 4x Breakthrough polarizing filter on the 80/1.7. Processed with shadows +100, highlights -65 , +19 whites and pushed about 0.5 stops. Comments.