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Posted by Robert May on October 14, 2002 19:35:33 UTC

There are a lot of plans on the web for focuault testers. In addition, there are a fair number of places that describe the test and the theory behind it along with photos of mirrors under test.
All just a matter of searching the web.
The "fans" which probably look just like comets are the result of the scope not being collimated (another thing to search the web for!) and this is a characteristic of the parabolic mirror. There may be nothing wrong with the mirror or there could be but until you get the scope properly aligned, you can't tell.
There are also sevreral places on the web that describe testing telescopes with both real and artificial stars and even photos of the results.

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