Author Topic: Polemaster - Brand New Polar Alignment Tool from QHY  (Read 189 times)

Jason Bryant

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Polemaster - Brand New Polar Alignment Tool from QHY
« on: December 30, 2017, 01:30:43 PM »
Just saw this on the QHY twitter feed. Looks veryinteresting...

http://qhyccd.com/Po...html#PoleMaster



Brian Olatunji

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #1 on: December 31, 2017, 12:53:31 AM »
Nice to see someone thinking along new lines.
Blueman

David Washington

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #2 on: January 01, 2018, 06:19:26 AM »
The real question is how easy it will be to align to your Ra axis provided you attach it in the finder bracket.

sdelbapaglo

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #3 on: January 04, 2018, 07:28:34 AM »
Looks interesting. I was unsuccessful in my attempt to find a PDF manual on it at the site.

closfockralperp

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #4 on: January 04, 2018, 10:14:09 PM »
Yeah, PDF is not up yet.

Paul

Myron Apostolics

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #5 on: January 08, 2018, 07:56:38 AM »
If it attaches to the finder bracket then you better hope that your finder is orthogonal to your actual mount, not the scope, it's mounted on. I looked at the diagram and it does seem to have some push pull screws to get around that problem, though. Hopefully then it would just need to be adjusted once and could be taken down and put back up without losing its position.

If you take down and remount your finder, though, won't it need to be adjusted again? The RAPAS that AP makes attaches directly to the RA axis. That way, once you get it aligned, it just takes 5 minutes or less to be polar aligned (in my limited experience) and it's accurate to a couple of arc minutes.

Rgrds-Ross

Alex Hart

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #6 on: January 10, 2018, 12:25:54 AM »
Interesting. It looks to me as though you could probably rig a means of attachment directly to the RA axis, depending on your mount.

Now, how much is it going to cost?

Greg Fleming

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #7 on: January 11, 2018, 03:24:24 PM »
Just for info, we have a small triangular asterism down here that is right near the pole, and i had always wondered if a sensitive camera could be used to locate it.
To get around any need to really refine the axis of the polarscope to the RA axle, i thought that if you declutched the scope and slewed to HA = 6 and took a shot, then moved to HA = -6 and took a shot, it could simply split the difference.

Andrew Johansen Melbourne Australia

unmoharib

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #8 on: January 12, 2018, 10:11:10 AM »
Quote
Interesting. It looks to me as though you could probably rig a means of attachment directly to the RA axis, depending on your mount.

Now, how much is it going to cost?

 

$199 according to twitter...

Quote

If it attaches to the finder bracket then you better hope that your finder is orthogonal to your actual mount, not the scope, it's mounted on. I looked at the diagram and it does seem to have some push pull screws to get around that problem, though. Hopefully then it would just need to be adjusted once and could be taken down and put back up without losing its position.

If you take down and remount your finder, though, won't it need to be adjusted again? The RAPAS that AP makes attaches directly to the RA axis. That way, once you get it aligned, it just takes 5 minutes or less to be polar aligned (in my limited experience) and it's accurate to a couple of arc minutes.

Rgrds-Ross

Yeah I wouldn't take it on and off. I don't use a finder so I could probably be telrad, this, and star sense all on a scope. Also it looks like you could probably figure out how to attach it to the front of the RA axis. This would be really helpful for ASA, Paramount, and CGE Pro mounts without a built in polar scope.

adectisun

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #9 on: January 12, 2018, 11:22:09 AM »
200 bucks is reasonable if the software is good and the camera works.
Just don't need a re-hash of the Starsense... 😊

geblusandde

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #10 on: January 12, 2018, 11:41:23 AM »
Would be cool if you could screw this into the hole for the polar scope cover that some mounts have, like mine.!

Ghassan Pham

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #11 on: January 13, 2018, 07:44:15 AM »
I spoke to someone at a star party once who used his camera to evaluate polar alignment.

He'd set up his image capture software with crosshairs on the center. He'd then do a 10 second exposure, release the RA clutch, and move the RA through its full range.

Polaris would leave a star trail of a half circle. He'd do this a couple of times and adjust the mount so that the crosshairs were at the center of the circle when he did this.

Jerry Dunn

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #12 on: January 13, 2018, 12:11:38 PM »
Gday WadeH
<p class="citation">Quote

Polaris would leave a star trail of a half circle. He'd do this a couple of times and adjust the mount so that the crosshairs were at the center of the circle
[/quote]
I think thats the same concept as what i was thinking, but not sure our asterism would leave trails, as its brightest star is around mag 7.0.
I guess if you did a shot at HA = -6 then HA=0 then HA=+6, you could very quicky triangulate an error offset.
The beauty of this method is you dont need to be aligned or tracking, as any tracking related errors near the pole will be negligible.

Andrew Johansen Melbourne Australia

ryepittimy

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #13 on: January 16, 2018, 07:23:32 AM »
I think the qhy device should work pretty well - but it would need to be aligned accurately with the ra axis - so it is measuring the right thing.As for centering the circular arc of Polaris - I'm afraid that would be limited by how well the center of the image matches the true polar axis when the mount is polar aligned - and that would be affected by cone. So - as with many of these techniques it is limited by imperfections of the mount and optics.Things like drift alignment rely on differential motion - so they avoid these issues. The qhy device would need to be aligned accurately with the ra axis - but once it is aligned and stays there - I think it should work pretty well.Frank

Mohamed Wiest

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Re: Polemaster - Brand New Polar Alignment Tool from QHY
« Reply #14 on: January 18, 2018, 02:00:32 AM »
This device seems to be based on the same principle as my PARot program
http://www.cloudynig...olar-alignment/
If it is the case, then the misalignment of thecamera with the axis of the mount is immaterial. I wonder how they implemented the correction for the atmospheric refraction.