Assertion: film camera | /r/CapableOf | reduce the need
Facets:
value: for stopping and starting the film
type: PURPOSE
Source sentences:
text: High-speed film cameras can film up to a quarter of a million frames per second by running the film over a rotating prism or mirror instead of using a shutter, thus reducing the need for stopping and starting the film behind a shutter which would tear the film stock at such speeds.