Yes it is the ONAG by Innovations Foresight (Gaston Baudat). It splits the image into an IR and visual, with the IR going to the guider and visual to the main camera. The problem is that most people don't want to spend the money for a large enough sensor on the IR/guiding side. But now I think there are some cheap Chinese cameras with no cooler and "grungy" but large sensors that would serve this well if their IR sensitivity is good enough
ah ha right just couldn't think of it. I remember speaking with him at several gatherings Very nice guy.
Well its worth a shot.
Peter