Neutral density filter ND 1.8. Gray filter with a diameter of 82 mm. This neutral density filter reduces exposure by 6 stops, allowing for better control over exposure settings. By uniformly increasing the density across the entire image area, it can decrease depth of field to isolate the subject. The shutter speed can be shortened to enhance image blur and emphasize the impression of movement or to smooth out the appearance of flowing water. Equipped with exclusive Multi-Resistant Coating (MRC) Nano-Premium coating technology. Material: brass. ND filters extend exposure time. A neutral density filter (ND filter) or gray filter blocks a portion of the incoming light. With a gray filter, you significantly extend the exposure time, achieving effects such as blurred water or preventing overexposure in bright sunlight while using a wide aperture.