Three f-stop strength difference between the two cameras allows the telephoto camera has more light with Split-nd Freewell Gimbal Safe technology ensures no negative impact on a gimbal,Filters weight only 3.1g Ultimate Protection with Hard Case Freewell ND filters are constructed to reduce light hitting the sensor, which slows down the camera's shutter speed. This creates a more natural-looking motion blur that smooths out footage and helps reduce the appearance of "jello" effects from the camera's rolling shutter. The ND Filters can also be used for reducing lens flare while shooting into the sun and for toning down highlights while filming outdoors.