Freewell "Standard Day" filter set for OSMO NANO – 4 pcs.Freewell "Standard Day" filter set for OSMO NANO 4 pcs. The ND8, ND16, ND32, and ND64 filter set is designed for shooting in bright sunlight, when it is difficult to achieve the perfect exposure. Each filter reduces the amount of light reaching the lens, allowing for better motion blur and a more natural look without overexposure or loss of detail. ND8 (3 stop light reduction) works well on slightly cloudy days, ND16 (4 stop) in standard sunny