Quote:
Originally Posted by tlgerdes
The asymmetrical stars could be the result of image plane tilt, especially if you are using the stock focuser.
Download ccd inspector and get it to analyze your subs.
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The above is good advice. The truth is you don't really know where the problem lies. I wouldn't touch the rear of the scope and only make adjustments to the secondary. However having said that, the problem As Trevor states could well be with your focuser. I assume you are still using the stock focuser that came with the scope? Although they are an improvement they can still be sloppy and have an inherent tilt that will drive you mad in trying to get collimation. My first advice is to get a decent focuser as the scope warrants it. Either a MoonLight or Feathertouch - I recommend the former as I've had great service from mine. Then follow Dave Cortners procedure and then Al's collimation aid. This will get you very well collimated and it's free. By all means if you want a Tak scope get it but the eye is a better collimator and the Tak scope just amplifies what the eye can see. The hardest scope I had to collimate was a Vixen VC200L and that was done all by eye and is the best way to do it. But it's only advice and free too so do what you feel is right.
See this site for information re the ccdt67 and it's bigger brother.
http://www.astro-physics.com/tech_su...r-techdata.pdf
Allan