For my "modern" lenses, and the not-so-modern ones that have standard filter threads, I merely use step-up rings to a few filter sizes. For the odd but "special" lens (e.g., 14" Berlin Dagor) I use a solution custom to that lens, like a clamp-on adapter or SK Grimes custom threaded mount to a common filter thread.
However, that leaves a whole bunch of old, mostly brass, mostly small lenses that either have no filter threads or have non-standard threads or are too tiny (think Protar V) to take a step-up ring. What ideas do you have for filtering these lenses without a whole bunch of expensive custom step-up or clamp-on rings? I was thinking something that I could cantilever off the front standard like the Linhof holder, but it would have to use a common screw-in filter size to utilize my already too-large collection of filters (and hopefully not be too large, as these lenses are mostly tiny).
It would be used on either a 171 Arca or a 4x5 Galvin, and I could machine a custom adapter to those cameras if needed. Thanks.
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