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Arizona-Ken
sage
Reged: 08/31/08
Posts: 307
Loc: Scottsdale, Arizona
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I may have the opportunity to pick up a used CPC 1100 as a friend of mine knows someone who has theirs up for sale.
The scope has the Starizona Hyperstar conversion kit installed on it; however this is not a feature that is important to me as I am a visual only guy.
Does the Hyperstar conversion have any effect on visual use? Essentially can I just "ignore" its presence? Does it make collimation adjustments any more difficult?
I expect to be able to see the telescope under suburban skies to check out the optics. I know to check the proper operation of the scope; will walk through the GPS and hand paddle use; look for abnormal wear, etc. What else should I look for?
Thanks!
Arizona Ken
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"Considered as a collector of rare and precious things, the amateur astronomer has a great advantage over amateurs in other fields ... the amateur astronomer has access at all times to the original objects of his study; the masterworks of the heavens belong to him as much as to the great observatories of the world. And there is no privilege like that of being allowed to stand in the presence of the original."
--Robert Burnham Jr, Burnham's Celestial Handbook
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mclewis1
Thread Killer
Reged: 02/25/06
Posts: 3946
Loc: New Brunswick, Canada
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When installing a Hyperstar you replace the secondary mirror with a removable carrier. All the original collimation bolts and such are still in place. The carrier doesn't affect normal operation. If you sell the Hyperstar kit you'll have to remove the carrier and put the original secondary mirror back as it was originally installed.
Maybe a quick look at a star test pattern to see if there is anything obviously wrong.
Listen carefully when the scope is tracking ... watch for clicks as the scope tracks. These likely wouldn't be show stoppers for the sale but if the scope is noisy when tracking then you'll likely need to perform some adjustments.
Make sure the scope comes with the SCT thread adapter ring that threads onto those large 3.29" threads on the rear of the scope. If someone adds a large aperture visual back they often remove this adapter and forget to include it during a sale.
Make sure the clutches work well and can be sufficiently tightened.
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Mark
C11, C6, APM/TMB115, and AT80ED - Tandem mount CGE and CG-5A, WO EZ-Touch and AT Voyager
25x100s and 8x56s, T-Mount Light, Mark 1 eyeballs - Modded 350D, DSI-P, SPC900, Mallincam
Just because you can doesn't necessarily mean that you should
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Arizona-Ken
sage
Reged: 08/31/08
Posts: 307
Loc: Scottsdale, Arizona
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Mark:
Thank you!
Arizona Ken
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"Considered as a collector of rare and precious things, the amateur astronomer has a great advantage over amateurs in other fields ... the amateur astronomer has access at all times to the original objects of his study; the masterworks of the heavens belong to him as much as to the great observatories of the world. And there is no privilege like that of being allowed to stand in the presence of the original."
--Robert Burnham Jr, Burnham's Celestial Handbook
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Starhawk
sage
Reged: 09/16/08
Posts: 423
Loc: Tucson, Arizona
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Don't remove the hyperstar kit. If you really want a scope without it, get the scope. It doesn't adversely affect performance- in fact, Celestron's highest end telescopes all have this feature. And if you have a Nikon, Canon, or Pentax DSLR, you could get a Hyperstar kit and start imaging through the scope.
However, you should look at the secondary mirror and make sure it hasn't been damaged by improper re-installation. If someone tries to go straight in, it is possible to hit the mirrored surface against the housing.
The Starizona guys have a trick where they put a removed secondary back in by tilting it and touching the non-mirrored side to the housing and then straighten it out so it is inside the bore of the secondary carrier. Don't tighten the secondary locking ring beyond initial snug (when you are threading it on). It has a pin to clock it the right way. You should always have the telescope pointed slightly up when doing anything with this feature.
Ask if the OTA has been opened up (it should not have been). Don't get it if there are dents in the OTA from crashes during installation.
Stephen Macmillan has a very good technique for moving one of these to a wedge safely:
http://www.stephenmacmillan.com/astro/wedge.html
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I lost count of my scopes. Now I just want mobility.
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