Has anyone tried this?
This is my predicament: a Schneider 95mm Schneider center ND filter (IVa-10591 with 1.5 exposure correction) for my 90mm Super Angulon XL seems impossible to find on the used market. New ones are special order and go for over a grand. Now the rear of the 90mm Super Angulon XL is not threaded but would easily allow one to slip in an 82mm Center ND filter: Schneider IV, Heliopan ND, or Rodenstock E82/112 (all 1.5 exposure correction). Slipping in a thin rimed 82mm filter into the back of the XL seems to cause a little vignetting, but not enough to really matter, this I have to check out further. Cost wise, have seen used 82mm center ND filters go for 1/3 of the price of a 95mm Schneider.
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