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Matt,
drop me an email and I'll send you a copy of the PST Mod write-up.
Main points:
The PST etalon must positioned 200mm inside prime focus - once positioned it NEVER moves again - so no real need for a focuser up front.
An ERF either at the front aperture or internal is mandatory.
Focusing is done behind the etalon - the eyepiece/ camera moves NOT the etalon - the back focus will be 200mm.
Ken
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