1. ND scrim is mainly used when the light is too bright by reducing the amount of incoming light so that the camera can choose the correct exposure value to avoid overexposure. 2. The larger the ND value of the ND scrim, the more obvious the effect of light reduction. 3. It can also be a large number of 'resist' scattered light, you can improve the colour saturation of the picture, so that the picture is more transparent and beautiful. 4. The use of light-reducing lenses can also use slower shutter speeds to some special effects, such as foggy running water, light tracks at night and so on. 5. When video under the scorching sun, you can reduce the shutter speed through the scrim to make the video image have proper motion blur and look more comfortable. Name: Filter Series Applicable models: For Action 5 Pro/4/3 Colour:As Shown Material:Aluminum alloy + optical glass style: ND64 Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 * Lens Filter 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.