I have a couple of convertible lenses, one in Copal 0 and one in Copal 1, both of which are converted to the longer focal length by removing the front cell from the shutter. Does anyone make standard adapters that would allow me to use filters with these? The Copal 0 front cell thread is 29.5x0.5mm, for Copal 1 it's 40x0.75mm, and I've been unable to find filters or stepup rings that will screw in to either shutter.
I'm also interested in something to fit an Acme #3 Synchro (not the Kodak version) to use with a 215mm f/4.8 Acuton.
Yes, I know I could get custom step-ups made at SKG, and may ultimately do that, but was hoping to find something off the shelf. Given the past popularity of convertible lenses, I'm a little surprised nothing seems to exist.
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