The H&Y; RevoRing Variable Neutral Density (VND) and Circular Polarizer (CPL) Filter is a revolutionary tool that combines the innovative RevoRing variable adapter technology with H&Y's; industry-leading VND and CPL combination filter. This unique and comprehensive solution is designed to meet the needs of photographers and videographers worldwide.This high-quality filter eliminates the need for multiple filters or step rings, as the RevoRing VND+CPL system is versatile enough to adapt to a wide array of lenses. This not only enhances handling but also significantly accelerates workflow speed. The product features a patent-pending variable and robust retractable blade technology, making it compatible with any lens with filter thread sizes ranging from 37 to 49mm.The RevoRing VND+CPL Variable ND + Circular Polarizer combination is a professional-grade tool that offers an impressive dynamic range of ND3 to ND1000, equivalent to 1.5 to 10 stops of light control. This allows for precise control over exposure and depth of field, making it an indispensable tool for capturing both moving and still images. Markers on the VND ring provide a clear indication of the maximum ND allowed for a specific focal length.The filter incorporates high-performance Japanese Nitto polarizing film to produce the Circular Polarizer section, offering an astounding 99.9% polarizing efficiency. The VND ring features a hard stop at the Min and Max points, preventing the VND filter from exceeding the Min/Max range. Guide pins on the VND and Circular Polarizer facilitate independent adjustment of each control for maximum convenience.The RevoRing VND+CPL is coated with Anti-Fingerprint & Waterproof Nano-Coating Technology, protecting the glass from the elements and making it easy to clean without fear of damaging the coatings. The German Schott B270 glass also features an Anti-Reflective coating, virtually eliminating all flare and reflections from the front and rear surfaces. This ensures optimal light transmission (up to 97%), resulting in the sharpest possible images.Regardless of whether you're shooting at 16mm or 400mm, the RevoRing VND+CPL's nine layers of coatings on both front and back surfaces ensure sharp, high-contrast images, even at 10 stops of ND. Please note that the stops achieved will vary based on different focal lengths. For more detailed information, please refer to the product guide included with every RevoRing VND+CPL or visit the H&Y; website.