Hello Everyone, My first post here. I picked up a Schneider Kreuznach Xenon 50mm f1.9 at a flea market. It looks like it has a DKL/Retina mount but the lens is not labeled "Retina". I have found similar lenses on the web and some have moving depth of field gauges on the barrel. My lens does not haf the DOF indicators. Does anyone know if this lens will work with the RainbowImaging DKL adapter? It looks like the adapter has a control for the aperture. Anyone have experience with this adapter and does it work well? Any thoughts on the lens itself? Thanks.