Thread: Moving the mirror of a GS for Astrophotography
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Old 12-12-2005, 03:41 PM
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[1ponders] (Paul)
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Moving the mirror of a GS for Astrophotography
I've wondered on occasion how far forward the primary mirror of a GS dob OTA (10 or 12") would need to be move to give sufficient focus travel for connecting a 300D. Or any reflector for that matter. Is there a simple formula to work this out?
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