Universal Square ND Filter: Perfectly fits for and matte boxes, this 4x 5.65inch square ND 2.1 filter (7 stops light reduction) is designed for versatile use across professional cameras and lenses, ensuring seamless integration into any professional videography or photography setup. High-Quality Optical Glass: Crafted from premium HD optical glass, this filter provides utmost clarity and image fidelity. Its CNC machined build prevents any color cast, maintaining true-to-life visuals without affecting image quality. Optimal Light Control: With an optical density of 2.1, enabling precise control over exposure settings to combat overly bright conditions and achieve balanced with ease. Multi-Coated Protection: Featuring dual-sided coatings, the filter resists scratches, repels water, oil, and fingerprints. Its maintenance is made simple with included cleaning wipes, ensuring and pristine condition through extensive use. Compact and Design: At just 0.16inch thick and weighing 147g, this ND filter poses minimal addition to , ensuring no cumbersome load while enhancing your capability. It includes a carry case for protection and easy transport. Lens thickness:4mm Due to different batches, there may be differences in product appearance and printed text, which will not affect use. Type:E:ND 2.1 Filter Colour:As Shown Material:Optical glass Package Contents: 1 * Filter 1 * Storage bag 1 * Cleaning cloth Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.