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Originally Posted by Astro_Bot
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Yes it does actually. One of the better articles I've come across.
Also the diagrams at the end of this page are useful, but they're "too perfect" to match what you'll really see, especially on a bad night.
http://www.willbell.com/tm/tm5.htm
Also a whole book! on the subject...wow. Anyone own this?
I'm certainly not seeing anything as extreme as anything in that article - no triangles, . I thought there *might* be a slight amount of astigmatism, but I had only tried at low power. With a 6.3mm eyepiece and without barlows or anything else the discs seem to flatten in very slightly in the same direction on both sides of focus. If there is an issue I think it's very minor.
I also tried using the software "aberrator" here:
http://aberrator.astronomy.net/
What I really need I'm not going to get - and that is someone with a lot of experience with telescope mirrors to take a look for me.