The Freewell ND16 Filter for DJI Osmo Action Camera darkens the image a bit and helps you capture clearer and more accurate outdoor images. Ideal for normal daylight conditions, it cuts the amount of light hitting the camera sensor by 4 f-stops. This reduction also lets you get creative by letting you use larger apertures or longer shutter speeds, which is why the filter is especially useful for long-exposure photography. The filter is made with premium optical glass and is multicoated with 16 layers of coating for waterproof, dustproof, scratchproof, and oilproof quality. It features an aluminum frame and has an efficient screw-on system for easily attaching and removing it.