I wonder if anybody uses the Voigtländer Tele-Dynar lenses that were available for these cameras in various focal lengths from 14 to 32cm. http://www.cameraeccentric.com/img/i...ander_1_28.jpg

There are a couple that are continually available from an infamous retailer on a well-known internet auction site at crazy stratospheric prices. I've never come across a sensibly-priced one.