ND filters give experienced users precise control over shutter speed, allowing them to make smooth movies in bright environments and with slower shutter speeds. Using this set can ensure sharp shooting, even when the shutter opens to 180° at a lower ISO*.
* Shutter Opening Angle: A common way to describe shutter speed versus frame rate. Exposure Time = Shutter Opening Angle/(Frame Rate × 360°). For example, if the camera is recording at 24 fps with the shutter open 180°, the shutter speed is 1/48 s.