1、TIGHT FIT: Suitable for SmallRig and other 4x5.65inch filter frames or hoods. Filter loading device is built into the camera hood, which significantly reduces post production work by loading filters. 2、FUNCTION: The function includes softening the image, reducing the contrast, adjusting the tone and color of the picture, or forming a special picture effect according to the creative intent, so as to make the picture taken more interesting. Use black diffusion filter to weaken the digital sense and enhance the ambience of the picture, reduce the sharpness of the picture. It also reduces contrast, diffuses highlights, and reduces glare to create a dreamy, cinematic effect. 3、COATING PROCESS: It adopts premium optical glass with high flatness and high transmittance. It adopts double sided multi layer coating process to realize gradual light reduction. 4、EASY TO CLEAN: The black diffusion filter is plated on both sides with a water resistant and anti grime film layer, making it easy to clean, dust proof and scratch resistant, without leaving marks. 5、MORE COMPATIBILITY: Unlike traditional round filters, the square filter is usually mounted on a hood or filter frame and is compatible with larger lens sizes. Item Type: Black Diffusion Filter Material: Optical Glass Product Size: Approx. 10.16x14.4cm / 4.0x5.7in 1 x Black Diffusion Filter 1 x Storage Box