I have an N80 and it has trap focus capability. If you are interested in knowing more about this cool feature, see the post by BJ in the F100 section, same topic heading. Anyways, in a nut shell, set your program 11 to #4, the af lens to single servo. Say you want to take a picture a butterfly on a flower. Prefocus on the flower. Set your f stop to about f/16. Move back a hair and then when a butterfly lands on that flower move slowly towards the butterfly while you are depressing the shutter. When the butterfly comes into focus the camera will fire. Experiment without film to see what works for you. This will also work with dynamic focus too so that all focusing points will activate the shutter.
Hey gang, let's give credit where credit is due. mgchen posted this same kind of answer, based on info in a Chinese photography forum, a couple of days ago right here in this forum. And with mgchen's procedure, you don't need to hold down the shutter release and slowly move the camera forward, which seems like a drawback as you cannot leave the camera unattended as you can doing it mgchen's way.
Al, you are right. Sorry, I've had the N80 for a while now and didn't much care for it since it didn't work with my manual focus lenses, so this is my first venture into this site. As for mgchen's post, let me point out one difference, you can use all five focusing points if you use dynamic focusing in this mode. So, if you want to catch a bird leaving the nest, as soon as it hits any of the five points it will fire. Anyways, please go back to giving credit where credit is due. Thanks,