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Originally Posted by Starkler
I take it you have a sight tube with crosshairs at the end?
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No, it's a tectron cheshire.
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If you align the secondary by placing the crosshairs over the primary centre spot this will align the focuser axis to the optical axis, and there shouldn't be any shift.
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thanks for the tip, but the sight tube flops around in the focuser too much to be of use.
I've got it sorted now, the focuser needed shimming to get the secondary properly centered (couldn't before) and now the shift I mentioned is eliminated. The collimation didn't move one bit during an all nighter session.