Just a small point, but the fact that 2 F5s are linked to give 16 frames per second does not mean that you get through films in 2 seconds. Each camera is still 'only' running at 8fps, so will take the standard 4.odd seconds to rip through 36 frames(still pretty nimble). The 16fps comes by synchronising firing the second camera during the gaps between the 8fps of the first camera, so both cameras take the usual time to complete the job. A neat trick in my opinion and I have seen it used in adverts in the U.K. to get sequences of film taken from different angles but at movie camera frame rates. This creates a very unique sequence when computer knitted together (I forget the photographer). Stewart