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_comet_46p_winners.thumb.jpg.b3d48fd93cbd17bff31f578b27cc6f0d.jpg

markarian

Ha showing secondary image

Recommended Posts

21 minutes ago, carastro said:

Glad you have got to the bottom of it, and thanks for coming back to us.  It was certainly a mystery, but what are you going to do now?  Not use the MPCC?

Carole 

Definitely not going to use it - and it seems the 10 inch newt really doesn't need it. As Louise says - the sensor size probably means I gets away with it.

In fact the MPCC was doing really weird things to the stars - even at the correct spacing. Not sure what was going on there. It worked fined for the 8 inch newt.

Edited by markarian

Share this post


Link to post
Share on other sites

Don't know if it will show in the corners or not - depends on seeing and guiding, but

F/4.8 10" Newtonian has diffraction limited field of about 2.45mm. Atik 460Ex has diagonal of 16mm so in effect only about 15% of field is diffraction limited.

Share this post


Link to post
Share on other sites

This I took  last night shows much better stars without the MPCC than with surprisingly. Even stars in the corners look pretty good.

 

Share this post


Link to post
Share on other sites
1 hour ago, markarian said:

This I took  last night shows much better stars without the MPCC than with surprisingly. Even stars in the corners look pretty good.

 

It's actually not that surprising :D

Level of coma is - I would not expect it to be so small, and have a look at collimation - it looks like it's a tiny bit off - stars in bottom left corner look really good, and in top right more coma shows (you want to balance it out to be about equal in each corner).

Star shapes on the other hand tend to be worse with Baader MPCC on fast scopes - due to spherical aberration introduced, so no wonder stars look tighter in center field without MPCC.

  • Like 1

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.