Only 7mm thickness, Wide-angle lens compatible ultra-thin frame. With Zomei Variable Density Neutral Gray filters, users can select the intensity from ND2 (1 f-stop) to ND400 (8+ f-stops) by rotating the front ring. Glass mounted with high-pressure press technology. Original AGC Optical Glass from Japan. All Materials Used in this filter Meet the Requirements of the European Union's standards of Environment Protection-ROHS(Restrictions on Hazardous Substances).
Neutral Density filters are used to reduce the quantity of light that reaches the sensor of the camera. They allow decreasing the shutter speed in order to achieve motion blur (waterfalls, ocean, clouds...) and/or to reduce the depth of field in very bright conditions. As they are "neutral", ND filters do not affect color rendition. With Zomei Variable Density Neutral Gray filters, users can select the intensity from ND2 (1 f-stop) to ND400 (8+ f-stops) by rotating the front ring.