ND——-Extend exposure time.Try an ND or neutral density filter. ND filters reduce the amount of light entering the lens. This makes it easier to achieve effects such as a shallower depth of field or blurred motion.

• The neutral density filter can be adjusted from 1 to 5 stops, easy to create different light reduction effects by rotating the ring.
• The front diameter is larger than the back diameter of this filter, which is specially designed to avoid vignetting at a wide-angle lens.
• Allows the use of slow shutter speeds, with high-speed films or digital cameras, to record movement/image blur in subjects.
• Decrease the depth of field by using wider apertures, which helps separate subjects from their background.