I've recently bought a Vitessa L with the f2 Ultron and would like to find filters and a lens hood for it. What complicates the issue is that the lens mount uses what Voigtlander calls "bayonet" mount accessories. Unlike Rollei this amounts to an interrupted thread. I could use a Series adaptor but I hate to scar the lens. I'm not sure whether filters for the Vitessa T with interchangeable lenses would fit the L.