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akulapanam
super member


Reged: 08/27/12

All star polar align new
      #5632248 - 01/19/13 09:31 PM

This is the other issue I did ran into tonight. I did my eq auto align, went to my third star hit align mount and finished the process. Then I turned off the mount redid the eq auto align connected the camera and discovered that my polar align was pretty far off (max exposure 15 seconds).

Then I redid my polar align in live view and discovered that I had to do quite a bit of correction again. This time rather than turning off the mount I simply replaced my existing eq alignment stars. This seems to have worked ok as I'm getting 40 second exposures.

Is there anything I can do to get better polar alignment unguided?


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Motokid600
super member


Reged: 06/27/10

Loc: Berlin, New Jersey
Re: All star polar align new [Re: akulapanam]
      #5632529 - 01/20/13 12:59 AM

I've been meaning to give this a try.

http://www.cloudynights.com/item.php?item_id=2838


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cn register 5
scholastic sledgehammer


Reged: 12/26/12

Re: All star polar align new [Re: Motokid600]
      #5632643 - 01/20/13 04:46 AM

The ASPA can be no more accurate than the initial alignment. If there's a problem with that then the polar alignment will not be good.
Using live view on your camera may help to get a good alignment because it's easier to get the stars centred accurately, both for the alignment and the ASPA.

There's no need to redo the alignment after the ASPA because the scope will adjust the pointing model by the amount of correction made.

Chris


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Motokid600
super member


Reged: 06/27/10

Loc: Berlin, New Jersey
Re: All star polar align new [Re: akulapanam]
      #5632834 - 01/20/13 09:49 AM

You know I can never get the sync'ed star to go right back into the center. I use backyard EOS ( damn near a must have ) so I have a reticule overlay on my live view. And no matter how many adjustments I make ( Cpc1100 on a Mitty wedge ) the sync'ed star always falls about an inch to the right of center on my screen. Maybe I'm doing something wrong?

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rmollise
Postmaster
*****

Reged: 07/06/07

Re: All star polar align [Re: Motokid600]
      #5632951 - 01/20/13 10:50 AM

If it's not easy to get the star in the center using the wedge alt/az adjusters, you need to choose another star. Like one closer to the intersection of the Meridian and Celestial Equator...

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