ND4 Filter 30.5 mm• Subdues intense light in skiing and beach scenes• Useful to reduce shutter-speed & depth of field• Reduces light transmission to 1/4 (NDx4)• Recommended for video camcorders, digital photography, & film photography• Available in sizes from 30.5 up to 77 mmDetailsThis neutral density filter subdues intense light in skiing and beach sceneries and is useful to reduce shutter speed and depth of field.• Reduces light transmission to 1/4 (NDx4)• F-stop reduction: 2• Transmittance: 25%• Recommended for video camcorders, digital photography, & film photography• Available in sizes from 30.5 up to 77 mm