Thread: Tube flex in GSO 12 inch Dob
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Old 06-05-2013, 03:50 PM
Wavytone
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Join Date: Jul 2008
Location: Killara, Sydney
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a. Secondary spider movement,
b. Tube could be flexing,
c. The primary moving in its cell,
d. Focusser sags as the orientation shifts.

or... all of the above, to some extent.
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