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Compatible with FLIP4 filter frames for GoPro HERO4, HERO3+, and HERO3 cameras, the FLIP4 55mm Graduated Neutral Density Filter from Flip Filters is designed for above-water use and allows you to darken specific areas of your images, such as bright skies, while allowing for a normal, unaffected exposure in the other regions. In order to attach the filter to a FLIP4 frame, a separately-available 55mm Threaded Adapter is required. It is also compatible with FLIP3.1 filter frames using the same adapter.