The Freewell ND4 Filter for DJI Pocket 2 & Osmo Pocket allows you to capture clearer and more accurate outdoor images with your gimbal. The ND4 filter cuts light hitting the camera sensor by 2 f-stops to adjust for overcast or fairly cloudy daylight conditions. 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's optical glass is multicoated on both sides to allow for optimal image quality.