Thank you Mark. From your wonderful posting I ventured to take my 12 inch Velostigmat II apart and remove the tiny screw that restricts the number of rotations for the outer ring - allowing for more control of the level of soft focus. It was a little dicey taking out the retainer ring as it stuck a bit. I should have covered the lens with tape. I didn't scratch the lens but I did scratch the retaining ring with the spanner wrench. My lens is about 1928 in a Betax #5 shutter.
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