Advantages:
Unmatched Optics: Each of Freewell 4K Series optics are handcrafted precisely made compatible with Hero11/10/9 Black (Naked)
High Quality Optical Glass ：
The use of High-Quality Glass Raw Materials, the Quality is far better than most brands on the Market.
Oil Prevention, Dust Resistance, Scratch Resistant and Lifetime Warranty
Wide Application ：
The Gopro Hero 9/10/11/12 Action Camera Comes with Freewell's Tailor-made dimming Filter.
Whether you are hiking, Skydiving, surfing, Skiing and other Sports, you will be able to take the perfect photo and video.
Use environment ：
CPL (circular polarizer) is mainly used to eliminate reflected light
The ND4/PL polarizer reduces the amount of light entering the camera lens by 2 stops and can be used in cloudy daytime conditions for clear images and lenses.
The ND8/PL dimmer polarizer reduces the amount of light entering the camera lens by 3 stops, which helps to take clear images even in sunny outdoor conditions.
The ND16/PL reduction polarizer reduces the amount of light entering the camera lens by 4 stops, which helps to shoot balanced movie images in bright sunlight conditions, especially in the afternoon and early morning.
Use environment ：
The ND32/PL polarizer reduces the amount of light entering the camera lens by 5 stops, which helps to shoot clear and vivid color images in brighter sunlight conditions.
The ND64/PL polarizer reduces the amount of light entering the camera lens by 6 stops. Suitable for adding the coveted “motion blur” effect in very bright sunlight conditions, it also effectively prevents unnecessary reflected light from Windows, snow, water, etc., from damaging image quality.
NV anti-light goggles can effectively cut off some common light pollution, such as from city lights, from mercury gas, sodium and CRI low street lights and artificial light pollution.
Use environment ：
The ND4 lens helps reduce the shutter speed by 2 stops, which is perfect for taking crystal clear photos on cloudy or cloudy days with low daylight.
The ND8 reduces the amount of light entering the camera lens by 3 stops, which is very helpful for capturing realistic and sharp images, especially in cloudy daylight conditions.
The ND16 reduces the amount of light entering the camera lens by four stops, which helps balance the image and capture sharp shots in normal daytime conditions.
The ND32 reduces the amount of light falling on the sensor by five levels, making it suitable for bright and sunny daylight conditions.
Use environment ：
The ND64 Lens reduces the light falling on the sensor by 6 stops: suitable for very bright and sunny daylight conditions.
The ND1000 reduces the amount of light entering the camera lens by 10 stops and is suitable for shooting in very bright conditions, providing a natural blur effect and reducing the “jelly” effect caused by the camera shutter, while also reducing the glare that often occurs.
UV Protective mirror, mainly play a role in protecting the lens and improving the picture quality.
Attention:
Can luse filters underwater for action cameras likeGoPro,Insta360,or others?
None of the filters should be used underwater orduring water activity unless specified on the productpacking.
As such, ND, ND/PL, and CPL filters have no role in improving your footage underwater; they are to be used on the ground to create motion blur in case of ND,ND/PL& removing reflection for CPL.
Using filters near heavy water activity, such as swimming，water skiing,etc. or natural storms can build pressure damaging the optics by creating moisture.
