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20 Aug 2017
INDI development team is happy to announce the release of INDI Library v1.5.0. This new exciting release builds on the maturity of INDI Library and comes with many new supported devices and fixes for existing drivers.
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TOPIC: Polemaster in KStars

Polemaster in KStars 11 months 1 day ago #13254

I don't know if this has been asked before but I would love to see in KStars a feature to polar align the mount by imaging the celestial pole region. Exactly what the QHY Polemaster does. There's a GitHub project that has some code in Python, could this be embedded in KStars?

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Polemaster in KStars 11 months 1 day ago #13255

+1

This feature now exists in Sharpcap 2.9 (Windows) where you do not need to buy a dedicated camera and an adapter to attach the camera to the PA scope, you use a either a guide scope with its camera attached or the main camera on the OTA. From what I read, it is working well and the precision is on par with polemaster or other methods.

I would also like to see this in INDI.

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Last Edit: by Vox45.

Polemaster in KStars 10 months 4 weeks ago #13296

I vote for this also.
Polermaster and similar polar alginment method been discussed 3 mounth ago in this topic : indilib.org/forum/general/1456-a-complet...for-polar-align.html

Sebastien

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Polemaster in KStars 10 months 6 days ago #13828

Hi,

having a pole alignment routine similiar to Polemaster would be great! Works like a charme in Sharpcap 2.9.

Clear skies!
Stephan

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Polemaster in KStars 10 months 6 days ago #13830

Can someone write a detailed description of how it works? It captures around polaris then asks you to adjust Alt/Az knobs until you center crosshair into some spot? If this is how it works, then it's mostly done in Ekos by "Correct Alt" and "Correct Az" buttons after you calculate the errors. But I guess it could be more user-friendly. Anyway, write a complete description please.

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Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?

Polemaster in KStars 10 months 6 days ago #13833

Hi!

I think this paper gives a decent summary:

www.syracuse-astro.org/pdf/2012_August_R..._Alignment_Scope.pdf

CS
Stephan
The following user(s) said Thank You: knro

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Polemaster in KStars 10 months 6 days ago #13834

there is also a git hub project ( github.com/ThemosTsikas/PhotoPolarAlign ) which refers to yet another paper:

www.considine.net/aplanatic/align.htm

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Polemaster in KStars 10 months 6 days ago #13845

Hi Jasem,

you may find several videos on youtube descripe the QHY Polemaster procedure. This one is particulary intersting:


An advantage I see in such method is that it allows you to align the mount without the need to load it with the whole equipments. Indeed, mount like the EQ6 are _very_ difficult to adjust in ALT once loaded with the OTA and the counter wheights.

Sebastien

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Polemaster in KStars 10 months 5 days ago #13859

Thanks. I'll add this to my TODO list. Will announce when it is ready for testing.
The following user(s) said Thank You: supernov

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Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?

Polemaster in KStars 9 months 3 weeks ago #14155

So some update on this. All the methods assume a fairly wide FOV. In my setup, I have less than 1x1 degrees with main camera and even less on guide cam. Here are some issues:

1. Small FOV? Sometimes even the NCP is not in the image (in my case at edge on parking)
2. Southern hemisphere?
3. Astrometry fails close to celestial poles. Maybe large FOV resolves this?
4. Possible to do astrometry father away from poles, but even then, WCS info would be unreliable this close to the poles.

So how to proceed with this? It's possible to continue using the existing method which is slower than Polemaster but it works on each axis independently. FITS View is now embedded in Align module so it is possible to show visual cues on how to move and adjust without leaving the screen. If there is a method that can work with all the limitations above, please let me know.

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Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?

Polemaster in KStars 9 months 3 weeks ago #14162

So it appears most problem are related to FOV issues. I'll try to see if I can solve today with ASI120M on Orion 50m guide scope.

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Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?

Polemaster in KStars 9 months 3 weeks ago #14163

Hi,
the windows software sharpcap 2.9 implements the polar alignment routine. The author mentions that it works best with a finder scope of about 200mm. It seems that his software is not perfectly working at other focal length. I think he mentioned that somewhere in a forum posts ... which I can't find right now.

Maybe this helps:
www.sharpcap.co.uk/sharpcap/polar-alignment

I have seen many posts that report arc minute polar alignment using a simple viewfinder within a couple of minutes.

Best wishes
Stephan

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