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Vary the amount of light entering the camera by 1.5 to 9 stops giving you great maintain exposure control
Built-in double ring design rotates to control amount of neutral density effect
Control depth of field by using a wider aperture allowing for slower shutter speeds as to create or control motion blur
Max shutter speed setting of 2 full seconds (9 stops) at the same f/11 aperture
Focusing more attention on the subject by decreaseing the depth-of-field with wider apertures
High-quality optical glass