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Mirko, et al,
The original SM60 scope was fitted with a front external etalon.
The later SM II versions changed to a smaller internal etalon.
My experience has been with the original SM60 arrangement.
The threads on the front of the etalons are different from the rear threads hence the need for an adaptor ring if two are to be mounted together.
There is no need to have the etalons "factory tuned".
It's a bit of a fiddle to achieve good double stacked performance, but can certainly be done.
I use an SM60 as a front double stack filter on a TS102 PST mod and the results are impressive!!
If you have some other ideas for double stacking just drop me a PM for discussions.
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