TELESIN CPL + ND 8 + ND 16 + ND 32 Lens Filter Kit, precisely engineered for DJI Action 3 4 camera. Made 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. CPL filter helps to remove unwanted reflections such as scattered light in the air, the reflection of metal and water, allows only parallel light to pass through to increases color saturation, creating deep, rich scenic images. 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.