I like my two scopes aligned. But they do not have to be exactly aligned to work great.
After all, they work independently of each other.
I will use Polaris for initial aligning. Then when I have as close of a same image between my Main Camera, and my PHD2 image of my Guide Camera, I can pick other stars (Vega, or a bright star) and check or fine tune the guide scope.
But close is close enough, because they are independent in operation.
For me, my guide scope is my "Course View" and my Main Camera is my "Fine View" during Modeling (Alignments).
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SonnyE
(I suggest viewed in full screen)
