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Need some sound advice...

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26 replies to this topic

#26 jgraham

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Posted 07 January 2019 - 04:26 PM

Coolness. Nearly all of my scopes have come from the used market and by far the #1 problem has been wonky colimation and a munged secondary support.

Ugh, the #2 problem that I have seen with GPS scopes has been LNT modules that have been installed upside down after the original owner installed an upgrade. It is a forgivable mistake, it looks right upside down, but it's upside down.

Ugh.
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#27 PKG

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Posted 26 May 2019 - 12:54 PM

The end result... Scope is fixed.  It was incredibly mis-aligned.  ( I am pretty convinced it was unloaded due to being so 'out of wack'.) Virtually impossible to collimate.  I ended up replacing the collimating springs and re-centering the secondary mirror. I used temporary shims to get it as close to center on the corrector plate as I could.  (Thanks maadscientist) Using Dr. Sherod suggestion I acquired the smallest eyepiece I could find and removed the lenses. Inserting it in the OTA, I was able to re-align the optics.  It worked.
Before the adjustment, I focused the scope on some wires hanging on a light poll about 100 yards away.  They were totally blurry.  After the adjustment, I could read the writing on the cables.  I cannot wait for a clear night to 'fine tune' it...


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