Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_30_second_exp_2_winners.thumb.jpg.b5430b40547c40d344fd4493776ab99f.jpg

Sammyb

Camera rotators for alt/az mounts

Recommended Posts

Hello - I saw one of these on the Modern Astronomy site and wondered if anyone had any thoughts on using them for correcting field rotation on long exposures with alt/az mounts?

Do they work? Would it be possible to get reasonable results?

Sam

Share this post


Link to post
Share on other sites

Our society's 20" is on an Alt/Az mount and we also auto-guide it with an old STV. The issue you get is that once you turn on the auto-guider the centre of rotation switches from the centre of the main field to the guide star. This renders a field rotator useless unless you using a separate rotator on the guide camera or an OAG. OAGs are problematic on a newtonian scope as you've generally only got limited back focus available.

I've some pictures taken with it (most recent were NGC 6888 and M42) on my blog http://blog.andrewluck.me.uk and if you follow the link from there to 'Far away things' you'll find some more images taken with it.

Share this post


Link to post
Share on other sites

This is a professionals' arrangement and carefully thought through. Nobody that I've ever come across has used the system in amateur imaging. It's possible that one day it might become available in a coherent package but for now I'd stick to a GEM and autoguider. WIth direct drive, unguided, and a complex model of the sky then a field derotated alt az can work. When your multi-tonne pro scope is too big for a GEM and really cries out for alt az then it's worth it. My neighbour Marc has a derotated alt az in his observatory. Erm... six million euros. Lottery ticket, anyone?

Olly

Edited by ollypenrice

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.