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Peter,
Thanks for the offer...I have one but not fitted it yet....
To answer a question I got - How can you focus the scope without the Crayford?
The PST etalon mod doesn't require an "up front focuser". The position, after final adjustment, is FIXED at -200mm inside the prime focus. It never moves again.
The final focus is obtained using a Borg helical focuser between the etalon and the BF diagonal. You can easily focus for visual or any camera.
(I have a detailed write-up available for the PST mods...PM an email address for a copy)
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