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FORUMS Photography Talk by Genre Astronomy & Celestial Talk
Thread started 30 Oct 2017 (Monday) 15:48
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polar alignment in Southern Hemisphere

 
ctvu
Member
36 posts
Joined Apr 2014
Oct 30, 2017 15:48 |  #1

Hi all,

I just bought a tracker (iOptron) and iOptron app as well, currently I am struggling with polar alignment since I am in Southern Hemisphere, the Polaris Australis is very dim, I could see the Southern Cross. I wanted to do 2-3 min long exposure.
Any tip/ help would be appreciated.
Cheers




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Nighthound
Cream of the Crop
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Joined Aug 2007
Nov 17, 2017 11:34 |  #2

I have no experience with the iOptron but make sure you have it set for Southern Hemisphere. The switch marked N/S should be set to "S".

This might be helpful:
https://www.youtube.co​m/watch?v=iXVVBlvlhbE (external link)


Steve
Canon Gear: 1D Mark IV | 1D Mark II | 5D | 20D | 500L IS (f/4) | 100-400L
My Astro Gallery http://s3.photobucket.​com ...7/Nighthd/POTN%20Ga​llery/external link

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andyjensen
Member
82 posts
Joined Jan 2011
Dec 19, 2017 23:43 |  #3

I'm not familiar with the southern sky at all (alas), but from what I've read and what I'm seeing on Stellarium, you can use the Southern Cross as a rough pointer, to get you in the vicinity. It'll kind of point to Chameleon, then you can move anti-clockwise to Octans, which looks like an almost-right triangle. South of Octans (toward the true pole) you'll find four stars in sort of a trapezoid shape; the pole star is the top left star of the trapezoid, if the wider end opens down toward the horizon.

You could also try just pointing it due south (make sure to account for your local magnetic declination) and set the angle to the local latitude (tripod level, of course), and you'll probably be close enough for round stars and 2-3 minute exposures at reasonable focal lengths. At this point, you may be able to pick out the star in the polar alignment scope; not sure how it behaves optically though.

I know your post was quite a while ago; if you haven't gotten it working to your satisfaction yet, I hope it's helpful.


Some clicking occurred, a few lenses were involved, that's about all I know ...

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polar alignment in Southern Hemisphere
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