17. Photographic cameras used to shoot the 2 state in order to study the flow to using a camera with a high shutter speed should be no less than 1/10, 000 s.
17. Photographic camera used to photograph the flow 2 status to continue to study the flow pattern of high quality photographic double exposure Shutter speed should be no less than 1/10000 s.
17. Photographic camera to take a picture using the flow status 2 to study the flow by following camera take high-quality photos should have Shutter speed is not lower than 1/10,000 s