77mm ND2-ND400 Adjustable Variable Neutral Density Filter 1. Offers ND2 to ND400 neutral density range. 2. Smooth rotation for precise density control. 3. Neutral density filters reduce light entering the lens without affecting color balance. Enable slower shutter speeds for motion blur effects. Allow wider apertures for shallow depth of field, ideal for portraiture and outdoor photography. 4. Slim profile design minimizes vignetting when used with wide-angle lenses. 5. Rotating filter mount allows adjustment of light transmission by turning the front ring. 6. Double-threaded design permits stacking with other filters. 7. Use as a protective filter to shield your lens from dust, scratches, and impact damage. 8. Supports wide apertures for controlled depth of field. 9. Ideal for long-exposure photography of waterfalls, streams, waves, and dynamic scenes. 10. Aluminum filter frame with multi-coated glass to reduce flare and ghosting.