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 Testing the optics of your telescope

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Keith



Posts : 6
Join date : 2011-08-26

PostSubject: Testing the optics of your telescope   Fri Aug 26, 2011 6:41 pm

As I understand you will gain experience in using your telescope especially if you direct your attention to the main points of quality. You will find in time that you will become critical of imperfections of your telescope, casual or inherent. When you test your telescope's optics, you should be careful and pay close attention to your own eyesight and be guided by proper directions and only then will you have a good idea of the quality of your telescope. Remember that no telescope will give the most perfect image. Your telescope is good when you can see fine definition and not to worry about the out of focus star image. If there seems to be a problem with the telescope because of the star image, you can not say what the problem is until you make an examination of the out-of-focus image on a night fine enough to allow you to make a star test at high power, unless the fault is because of a astigmatism, maladjustment, or centering of the optics and on a good night these can be seen at focus.
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scopeman

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Posts : 116
Join date : 2011-08-23

PostSubject: Re: Testing the optics of your telescope   Fri Aug 26, 2011 6:41 pm

It sounds like you are on the right track. Star tests are sensitive enough to reveal optical errors that would never be noticed at the eyepiece and it takes experience to read a star test quantitatively (I know I can't do it!) If you can, do a comparative test with a scope of known quality. As all your scopes are reflectors, your main consideration for a star test will be making sure the mirror has completely cooled to ambient conditions.
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Testing the optics of your telescope
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