[Femtometer]

I've been playing with the 645 auto bellows and decrypting the instructions for use on the 645D, but I can't seem to get it right. I have the mechanical release (cable release 30) and the coiled cord connector (infrared remote release cord 2P), but I don't see anywhere on the 645D to connect this to. Attaching the mechanical release stops down the lens when depressed, and I've tried to meter this way, but this doesn't seem like it should operate this way.