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Collimation of focuser
G'day, I am thinking of making or buying my own collimator, but I am Curious to know how do we know if our focuser is straight, I know with a laser collimator you can ensure that the laser is pointing at the secondary and then the primary and then back through the collimator hole, but how do we know our focuser is straight and square to the telescope tube?
Peter
Last edited by poider; 17-11-2016 at 05:57 AM.
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