flash sequencer

To analyse the motion of fast moving objects it is useful to be able to take a well-timed succession of photographs of the object under investigation. Ideally these photographs should be superimposed on the same frame (multi-exposure technique) so that the relationship between the various positions of the object can be examined in detail. However, the cqst of the camera needed for this type of photography is out of the reach of most amateurs (and many professionals). An alternative method is to leave the camera shutter open and produce a series of light flashes for the successive exposures, thereby producing similar results. This article describes an electronic flash sequencer which generates a series of five flashes. It is intended for photographic enthusiasts who require something extra from their existing equipment. Admittedly, professional flash sequencers are commercially available but at fairly high prices and financially, therefore, not the first choice of many amateurs.