Motion detection
Discussion
Oddly enough a Nikon D70 will do that - 'trap focus' - but only once before it needs resetting. It's a bizarrely useful software glitch!
For a longer lasting idea, how about: http://shop.nationalgeographic.com/jump.jsp?itemID...

For a longer lasting idea, how about: http://shop.nationalgeographic.com/jump.jsp?itemID...

Edited by Simpo Two on Sunday 4th January 22:14
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