【Matte Box ND Filter】 Designed for NEEWER matte box, also compatible with Tilta compatible with SmallRig mini matte box and filter frame. The 4"x5.65" sqaure filter enables better control over shutter speed and aperture, avoids overexposure and balances image exposure, perfect for photography and videography under bright sunlight with motion blur effects 【Flexible Light Control】 ND0.9 is for medium light ambience with 3 stops of light reduction and 12.5% light transmission; ND1.8 is for bright ambience with 6 stops of light reduction and 1.56% light transmission. These ND filters reduce the amount of light entering the lens for effective control of shutter speed and aperture, which avoids overexposure and balances the image exposure for the desired depth of field effect or motion blur effect 【HD Optical Glass】 NEEWER 4x5.65" ND filters are made of HD optical glass to provide superior image quality. No color cast, no color balance affected, perfect for 4K and 8K video recording and clear, sharp images 【Multi Protective Coatings】30 layers of coatings on both sides are resistant to scratches, oil, and fingerprints. They effectively reduces reflectivity to 0.2% while minimizing glare and dark corners for improved contrast and details 【Lightweight and Portable】 The slim design of the NEEWER ND filters adds a little weight when mounted. The included pouch provides extra protection for the filter, making it easy to carry on the go and ensuring that the filter is always in tip top condition