I have several Nikons and a Voigtlander Bessamatic that my dad bought new in 1962. I saw this item on Ebay and could not resist ordering. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=180169945456&_trksid=p3907.m32&_trkparms=tab%3DWatching#ebayphotohosting It's an adaptor that will (allegedly) allow me to use the vintage Voigtlander glass (and my converted Retina lenses) on the Nikon bodies. I haven't received it yet, but am wondering if anyone else here has used something similar. Supposedly, the aperture setting is fully converted so that it can be read by the Nikon body, hence all AI metering functions are maintained. It seems to me that there would have to be some increase in focal length, but I don't know for sure, or what that factor might be. I'll be sure to post full details and sample photos once I receive it!