Pluto Trigger - Manual (Page 23)

High-speed photography usually uses light/laser sensor and sound sensor
can respond to the light or sound change in a minimum delay (less than 1
millisecond).
The goal of the high-speed photography is capturing objects in motion. In
all cases you want to be able to detect a trigger, wait for an event and
take a picture. There are two methods for performing high-speed
photography. The first method uses a shutter of a camera. The second
method uses an electronic flash.
SHUTTER METHOD
The main advantage of the shutter method is that it can be used outdoors.
The subject and the background can be fully illuminated. Since the shutter
is used to freeze the motion of the subject, it offers a limited speed.
Maximum speed of a shutter could range from 1/4000sec to 1/8000sec, in
some cases it may not be fast enough.
Moreover, in cameras that have a focal plane shutter, a small slit moves
across the photographic plane at much slower speeds (1/250), thus
exposing different parts of the photographic plane at slightly different
times.
Finally, there is a delay between the shutter release and the actual
exposure. It could be as much 100ms or more (depending on camera). In
addition there could be a small variation in timing, each time the camera
takes a picture. Therefore this method should not be used when high timing
accuracy is required.
FLASH METHOD
The second method of high-speed photography is the flash method. The
picture is taken by opening the shutter of the camera, activating the flash
and closing the shutter. The picture needs to be taken in a dark room.