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Equipment Discussions >> Cats & Casses

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Eddgie
Postmaster
*****

Reged: 02/01/06

Re: Star Test on SCT new [Re: mattflastro]
      #5626596 - 01/16/13 05:06 PM

Well, I apologize for any misunderstanding on my part.

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mattflastro
Vendor - Astrovideo Systems


Reged: 07/31/09

Loc: Brevard County , FL
Re: Star Test on SCT [Re: Eddgie]
      #5629094 - 01/17/13 11:08 PM

Quote:

Well, I apologize for any misunderstanding on my part.



No need to apologize for such a small thing , I should be apologizing as well but on a more serious note your star testing skills and knowledge are amazing .


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Julio
sage
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Reged: 01/18/07

Loc: Pembroke Pines ,FL
Re: Star Test on SCT new [Re: Julio]
      #5629809 - 01/18/13 11:55 AM

I guess the lingering question is does the scope meet the difraction limited spec?

Edited by Julio (01/18/13 11:59 AM)


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Eddgie
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Reged: 02/01/06

Re: Star Test on SCT new [Re: Julio]
      #5629836 - 01/18/13 12:07 PM

Unless you have some reason to suspect that there is a serious error, then I would say that it is improbable that it has a flaw so serious that the scope is no longer diffraction limited (which in itself is rather vague, but is generally understood to equate to a Strehl of .8).

While your test was not done to the standard necessary to give a meaningful quantification of the errors I mentioned (maybe a bit of SA and a small zone) neither looked serious.

Your choices are to do more testing and attempt to quantify the error, or just start using your telescope and forget about it. I did not see a serious error in the scope.

If you want to see more tests, I recommend you go to this web site. It has plenty of star tests with different errors shown, and as you will see, your scope's test looks to show a scope with typical SCT quality. Not bad, but not great, and and almost always much better than diffraction lminted .8 Strehl) from Celestron.

Astro-Foren Test Directory.. Never seen a Celestron below .8, and most are .9...

There is also the Roddier test.

But you are wasting your time. Nothing in your test suggests the telescope is a lemon.

Edited by Eddgie (01/18/13 12:22 PM)


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