Neutral density filter ND 1.8. Gray filter with a diameter of 46 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 motion blur and intensify 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. This BW gray filter, which reduces the aperture by six stops, is already considered an extreme filter in image photography. It transforms 1/60 s into a full second of exposure time without altering the aperture (and depth of field). Flowing water is rendered sensitively. A tripod is required in any case. 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 with an open aperture.