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Blog Comments posted by Merlin66

  1. Gina,

    You don't have to worry about or consider any focusing of the donor scope.

    The etalon NEVER moves relative to the donor after initial set-up. It's always -200mm from the prime focus.

    Think about the donor just as a fixed replacement for the original gold tube in the PST.

    Final focusing is always achieved behind the etalon - I use a Borg helical focuser on my PST Mod.



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