4 intelligent ND filters for motion blurPlug in one of these Premium HB series ND filters, and your HERO13 Black automatically recognizes it and sets the movie mode to "Cinema (Auto)" so you can easily get motion blur. Advanced users can also manually adjust shutter speed and exposure to adjust the recording Ideal to the lighting conditions. The filters are made of scratch-resistant, high-quality glass and are waterproof when placed on the camera.RECEIVE DRAMATIC MOTION BLUR IN NO TIME AT ALLThis 4 pack ND filter contains ND4, ND8, ND16 and ND32 filters, which are made of high quality optical glass and give you easy and precise control over the exposure. They are suitable for a variety of conditionsand we recommend you to switch them up or down, even based on the current lighting.AUTOMATIC DETECTION: YOUR CAMERA RESPONDS IMMEDIATELYThe lenses automatically put your camera in the right mode with the right settings for your shots.AUTOMATIC ADJUSTMENT OF THE CORRECT EXPOSUREIs this the