Neutral density filter ND 1.8. Gray filter with a diameter of 55 mm. The 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 reduce depth of field to isolate the subject. The shutter speed can be shortened to increase image blur and enhance the impression of movement or to smooth the appearance of flowing water. Equipped with the exclusive Multi-Resistant Coating (MRC) Nano-Premium coating technology. Material: brass. This 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 changing the aperture (and depth of field). Flowing water is rendered delicately. 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 like blurred water or preventing overexposure in bright sunlight with an open aperture.