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A bit of a thread revival here, but the original post seemed somewhat relevant to me...
I used Astrobaby's guide and a cheshire to collimate my scope last night. Was a bit of a painstaking procedure, especially getting the secondary right, but finally I thought it was good to go. I threw my glatter laser in just as a cross check. In the tublug, the primary appeared to be perfectly aligned, but when I checked the alignment of the secondary by observing where the red dot fell, it was maybe half a cm from the center of the mark.
I ignored that and used the scope anyway, the collimation seemed pretty good (saw the Cassini division in Saturn's rings) although a few stars had a "cross" of light coming from them - Astrobaby's guide called this "astigmatism" and blamed it on bad collimation of the secondary (I spent ages on that #@&*ing thing!!!) or on poor quality optics (even worse).
Anyway, my question is, if you collimate a scope using a cheshire, should the collimation appear spot on when you check it with a laser, and vice versa?
Thanks guys!
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