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What's the point of a ND filter? I tried shooting with one yesterday and it felt like all it was doing was taking away sharpness even at the lowest levels and making it unfocused with a brown tint. I'm using a KF ND2-400 variable ND filter on a Sony ZV1 using a 40.5mm adapter. Could it also be because of viginetting? My pics taken with a Hoya CPL looked better.