I recently read in Outdoor Photographer (July 2011) about a way to extend the reach for self-portraits (across a small lake in this case). Developed by San Diego photographer Robert Benson his system works with Canon and Nikon cameras.
“It consists of a naked circuit board (protected inside a supplied cell phone case) and three wires – one to a 9V battery, one to a walkie-talkie’s mini-phone jack and a third to the camera’s remote terminal. Press the Talk button on the second walkie-talkie, and the camera fires as long as the button is pushed. It’s available from www.robertbenson.com
An interesting solution to an interesting problem.