Product feature: Light control, color saturation enhancementMade with high grade multi-coated optical glass, high definition glass provides crystal clear footage, and the precise machine tooling ensures a secure fit.High transmittance over 99.5% does not reduce image quality, ultra-thin glass design to avoid vignetting.ND Filters give you the freedom to create your own work by allowing you to have more control of the camera's aperture, exposure time and sensor sensitivity settings. It helps you reduce the amount of light coming into the sensor. ND Filters Eliminate Washed Out Photos & Video Due to Bright Sunlight for Better Contrast & Rich Color.Note: There might be an error of 1-3 cm due to manual measurement, and slight color differences may occur as a result of varying lighting and monitor effects.