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I finally got the Lumicon step ring from Bintel, but once again it was just a tad too big. However, when I got a 2" filter from OPT (in the States), I had ordered a ring with it. Again too big, but with a slow action grinding wheel and a bit of patience I managed to get it ground down enough to fit into a 2" drawtube, so I think that's the way to go.
Geoff
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