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Strange issue with R5 using circular polariser filter. 100/500 and 100/400mk2 nice and sharp on subject say 100m away without filter but using a circular polariser filter image is out of focus I have different makes Hoya pro ,jessops K&F x2 with all different results ?none of which is sharp . 100/400 worked fine on old 1dx mk2.Question is camera at fault ,settings or do I just need a filter from the likes of B&W etc anybody else had this issue.