Did anyone ever use these things? Does anyone STILL use them? I just "discovered" them, and they blew my mind. *The N90S/420 setup was a standard Nikon 90S body with its back replaced by the KODAK 420 (or 460, 420IR, etc), which made it a digital camera. This was in the early 90s (?), before the digital camera memory sticks we all know and love today.