I use a 72-77 step-up ring for my ND filters. No issues.
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Thank you for all the reply.. i finally pull the trigger and get the 85mm 1.2 markii... when first time holding it, i feel that it is extremely heavy, even worst than my 24-70L. feel unbalance on the 5dm2. The picture produce at 1.2 really stunning and unforgettable. and i can't believe it is extremely sharp even at wide open 1.2.. usually my 50mm f1.4 need to tweak down to f1.8 to get better sharpness... THANK YOU all of your reply !! another reason i did not choose the 70-200mm is because of its size, which make me cannot carry it all the time..