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Flickr user foto_fer posted this nice writeup of how to make a cable trigger for his DSLR camera, to allow him to focus and snap photos without touching the camera. The original writeup is in Spanish, however you can read it in English using machine translation. The total cost was around US $22, however it could probably be made using scavenged parts for free.
Don't have a wired trigger port for your camera? Try a wireless remote for your Nikon DSLR, or an electromechanical trigger for any camera.
