Thanks Andy. Now I have to find me some lightning. Richard Cooper ----- Original Message ----- From: "ADavidhazy" <ANDPPH@ritvax.isc.rit.edu> To: "List for Photo/Imaging Educators - Professionals - Students" <photoforum@listserver.isc.rit.edu> Cc: <ANDPPH@vmsmail.rit.edu> Sent: Tuesday, December 03, 2002 10:26 AM Subject: Re: shutter release > > Is anybody using a shutter release device that is activated by either light > or sound. If a camera has a port for a wired remote shutter release device, > then a specialized remote wired device actived by lightning for example would > trigger the shutter. > > I use such "gadgets" on a periodic basis. My main application has been the > photography of barn swallows approaching their nest. They break a light beam > and this causes a "dark" activated circuit to close a switch and trigger the > camera which in turn fires the flash that provides the action stopping power > to make sharp photos of their wing feathers (and the bird as well!). > > One of my circuits is activated by light instead of dark and this one can be > used exactly as you describe. Usually though my main application has been the > one where a light or IR beam is interrupted (or a sound detected). BTW, for > sound I have applications where a flash is set off instead of the camera > because often the delay introduced by the mechanical nature of the camera's > shutter release is too long and sound producing events move too far in the time > it takes the camera to react. > > There are several commercial devices that work in either one, two or three > synchronization modes. I have a rudimentary circuit that I have used for many > years and still do in spite of some unreliability problems. It is described in > this article: http://www.rit.edu/~andpph/text-cross-beam.html > > There is a picture of how the system is set up for the birds here: > http://www.rit.edu/~andpph/photofile-c/barnswallow-14.jpg > > andy > > > > >
