Mongo said:Even if they're manual focus it probably wouldn't take much to reverse-engineer the chip.
You don't have to go through all that trouble. Most third-party Nikon compatible lenses are already chipped. Obviously Nikon has made the specifications known. The chip is part of Nikon's matrix metering system - used to provide subject distance information to the camera.
What I'm still mainly worried about is that the lens have any chip at all, so F80-s can meter with it. This is unfortunately not guranteed...