Features: - This is a Hoya multi-coated special effects filter suitable for film and digital. - Photographing solar eclipses and ultra-bright light sources can be extremely dangerous. This 52mm HMC NDx400 filter reduces light values by 9 stops to less than 1/500th of its original intensity and allows safe photography. It can also be used to achieve super slow shutter speeds in daylight to render moving subjects invisible.