Olympus OM-D ND filters
Alright so i have been looking in the right direction in my search. Could anyone recommend brands to get?
Quality usually linked to price, multi coated or super multi coated or somesuch names will help reduce flare problems that cheap filters cause. Hoya is a reliable brand for me, but there are others of course.
As suggested, maybe settle on 52mm filters with appropriate step-up rings for the smaller lens, or in some cases a slight step-down ring is also successful, like 58mm to 52mm for a tele zoom causes no problems.