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Equipment Discussions >> Mounts

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nemo129
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Reged: 01/03/10

Loc: WMass
Re: Alignment: Why will this not work? new [Re: dawziecat]
      #4438709 - 03/09/11 10:31 PM

Terry,
Have you looked at the Gemini II Quick Start Guide from here? It is kind of superficial right now, but it does cover some alignment topics.


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Sharkman
super member


Reged: 08/12/06

Loc: Nelson, New Zealand
Re: Alignment: Why will this not work? new [Re: nemo129]
      #4440415 - 03/10/11 04:17 PM

One problem with the technique in the OP is that it doesn't accurately detect or resolve the problems caused by drift.

If you're doing imaging, and you're looking for an alternative to the drift method, the approach described on the following page is interesting:

http://www.minorplanet.info/ObsGuides/Misc/ccdpolaralignment.htm


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nemo129
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Reged: 01/03/10

Loc: WMass
Re: Alignment: Why will this not work? new [Re: Sharkman]
      #4440472 - 03/10/11 04:37 PM

Sharkman,
Thanks for the info. I had actually seen a reference to this method before and it looks like a great idea (book marked it!). I will have to give it a try if the weather ever clears here!


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gdd
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Reged: 11/23/05

Loc: N Seattle suburb, WA
Re: Alignment: Why will this not work? new [Re: lawrie]
      #4440859 - 03/10/11 07:33 PM

Quote:

There is a couple functions in the Gemini that works like you describe,they are called polar axis correction assist and polar axis correction.






Hi Lawrie,

Are we saying the Polar Scope is a "nice to have" rather than "required" for quickly getting a good polar alignment with G11-Gemini? Just like the CGEM is supposed to make the polar scope optional?

Thanks,

Gale


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freestar8n
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Reged: 10/12/07

Re: Alignment: Why will this not work? new [Re: Sharkman]
      #4441121 - 03/10/11 09:53 PM

Quote:

One problem with the technique in the OP is that it doesn't accurately detect or resolve the problems caused by drift.




With the right mount and a little care, in about 10 seconds, and as part of the normal mount setup process, you can be polar aligned to within a fraction of a degree. It's not perfect and can be improved upon by later, much more time consuming methods - but the method is sound and limited only by how well your mount is calibrated and how repeatable things are when setup in the field.

But it only works well for certain mounts that store the mount model and can point blind at startup using that model.

Frank


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