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Airy disk in collimation

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#1 James Cunningham

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Posted 02 April 2012 - 08:54 AM

If I use Polaris as my first star for collimation, what should be the next star to use that is a little dimmer to get the airy disk? I live in the Eastern part of the U.S. Thanks.

#2 AhBok

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Posted 02 April 2012 - 09:23 AM

I use Polaris to check collimation (though lately, I've been using an artificial star to set collimation). At 303X Polaris exhibits a nice airy disk with two faint rings surrounding it.

#3 James Cunningham

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Posted 02 April 2012 - 09:29 AM

Then I will just use Polaris. I will get a one star alignment and magnify the image with a 2x barlow. That should get the airy disk. Its already collimated with concentric rings. I have an artificial star but can't seem to get the hang on using it.






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