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Polar alignment (skyguider) without Polaris

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#1 iassin

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Posted 27 May 2019 - 06:08 AM

Hello,

I image with a DSLR and a quite wide lens (270mm). Since my balcony faces south, it would be nice if I could polar align my skyguider (unguided) without moving to a wider sky. Do you know if there is any good method to do this?

 

Consider that:

- yes the lens is wide but without a quite good alignment I see trails after 90sec (which is good I think for an unguided mount)

- If it works the first time, I could perhaps draw a sign where the tripod should be to accelerate the process for the following times.

 

any ideas?



#2 Dave24137

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Posted 28 May 2019 - 04:20 PM

You could perform a loose alignment using a compass.

 

Compensating for magnetic declination: set a compass on the ground and have it point True North, align a tripod-leg in that exact direction, center the skyguider itself along that same line, and then set your latitude on the mount — and you'll be very roughly aligned.

 

I used this method during the last solar-eclipse in the US and it provided plenty of time to take pictures without the Sun moving out of frame. It might give you enough time, too.

 

That said, 270 mm is not wide and actually demands a proper alignment. So the further back you can zoom with this option, the better.


Edited by Dave24137, 28 May 2019 - 04:31 PM.


#3 OldManSky

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Posted 28 May 2019 - 08:10 PM

Learning to drift align is a useful skill, even in the days of Polemasters and iPolars...smile.gif

 

http://www.cwjames.i...ignment_ccd.htm

 

https://www.cloudyni...bert-vice-r2760


Edited by OldManSky, 28 May 2019 - 08:11 PM.

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#4 iassin

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Posted 29 May 2019 - 12:58 PM

Learning to drift align is a useful skill, even in the days of Polemasters and iPolars...smile.gif

 

http://www.cwjames.i...ignment_ccd.htm

 

https://www.cloudyni...bert-vice-r2760

Thank you, I will try this when the time is not good to do serious AP. I have two questions though:

1) On the skyguider you can set normal speed, half speed and southern rotation (the other way). Is it the same if I use 0.5x instead of 2x which I don't have on this tracker? I think manual slewing is way too fast to see an angle.

2) If I don't change my location and I have my latitude already set, I don't need to change it, do I? Or just setting the camera up will screw the alignment?

Edit: I remember I always have to tune a little bit the alt knob, so yeah maybe adding weight will lower the alignment.


Edited by iassin, 29 May 2019 - 01:00 PM.



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