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55mm Rodenstock HR Digital MC Neutral density filter ND 0.9 / 8X (3 Stops)  for reducing brightness, extending exposure time and intentionally reducing the depth of field by shooting at wide apertures in bright light.
Filter reduces light by 3 stops allowing for longer exposures or wide open apertures to be used in bright conditions.  

Premium optical glass  with perfect surface quality. Highly scratch-resistant. Neutral-tint, reducing the colour cast normally associated with ND filters.