Filter Frenzy. Add these GoPro ND Filter Kit for HERO13 Black (4-Pack) to your HERO13 for incremental light reduction and motion blur capabilities! Each of these waterproof, scratch-resistant filters provide you with a different level of light reduction: the ND4 filter provides 2 stops, ND8 provides 3 stops, ND16 provides 4 stops, and ND32 provides 5 stops. When attached, the HERO13 automatically detects the filter, and will suggest the best filter for your imaging based on lighting conditions!