【Square Camera Lens Effect Filter】Unlike traditional circular camera lens filter designed for particular lens thread size, this square ND filter can fit on most camera lens. Simply slide the 100x100mm black diffusion effect filter into a filter holder (not included) to reduce contrast, diffuse highlights, and create soft dreamy cinematic effect | 【1/4 Black Diffusion Filter for Cinematic Effect】Featuring great light transmittance, the black diffusion 1/4 filter effectively reduces highlights and lowers glare for soft cinematic effect on video and photo image. Well suited for portrait photography, as it helps soften wrinkles, blemishes and pores while maintaining skin tone values | 【HD Optical Glass Build】Made of HD optical glass, the filter delivers high clarity pictures without compromising image quality and minimizes reflections from the filter itself. The square filter design eliminates vignetting issue common to circular filters. No color cast | 【Multi Nano Coating Protection】The 28 layers of Nano coatings on both sides protect the filter against scratches, water, oil, dust, and fingerprint. Use the included cleaning wipes to clean the filter with ease | 【Wide Compatibility】With the standard 100mmx100mm size, the square filter is also compatible with Cokin Z pro filter holder and NEEWER filter holder (not included)