The COMPU-POINT is a microcomputer controlled laser pointer(s) synchronised to the camera shutter. The processor automatically detects the type of camera and switchs the lasers off and on as the shutter opens and closes so the laser spots are not seen on the film.
It can be used for actor position , product placement etc.
Two lasers can be mounted (as above) and their beams crossed at a set focal distance. When the spots coincide the cameraman knows he is focused.
Lasers are also useful for getting that cat to do and look at what you want.