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Originally Posted by bird
The real test of collimation is to look at a not-too-bright star, say mag 2, at ludicrous magnification of say 100x per inch of aperture. If the rings don't look circular then you're not finished collimating.
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I've given up on proper high-mag star testing months ago, lest I kick the OTA senseless in frustration. Trouble is that 1) at those magnifications a star rarely (if ever) looks anything but a fuzzy boiling mess, unless the scope has less than about 100mm of aperture. 2) And for us dobbers, without tracking, it is near impossible to make the adjustments anyway. Anyone got any tips for getting around these problems?