The Slow Mo Guys – record slow motion videos. In a recent episode they use a Phantom Flex Camera to capture the Canon 7D’s mirror box and shutter mechanism being triggered at a variety of shutter speeds (1/4000s, 1/8000s, etc). The footage itself was recorded at 10,000fps, and the result is a look at a shutter and mirror box in action – something that would otherwise be nearly invisible to the naked eye.
Also check out what they have done to that poor Canon 7D!