I recently acquired a Schneider-Kreuznach Retina-Tele-Arton f:4/85mm to use with my Bessamatic. I successfully performed the small machining job required to get the lens to fit the Voigtlander, and the results are superb! Really impressive glass, and surely the most compact 85 ever made. However, while the Voigtlander lenses all have a 40.5mm screw-in filter mount, the S-K lens has a bayonet-type filter mount. Does anyone have any idea how or where I might find filters to fit this lens? I'm looking for a UV and either (or both) yellow and orange. I've tried Ebay (which is where I found the lens), but have not seen anything in the way of filters, and don't really know what to look for in terms of dimensions, etc.. Any help will be appreciated.