Came across a used Contax 35mm extension bellows this afternoon - in great shape and practically free (well, $30). But I didn't buy it as I don't have a Contax camera. Is there a converter that will allow me to use it with my Nikon gear or am I out of luck? If the latter, are there any Contax users out there who'd be interested in it? I'd be happy to nab it for a fellow APUGger.