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_solar_25_winners.thumb.jpg.fe4e711c64054f3c9486c752d0bcd6f2.jpg

Sign in to follow this  
MikeD

NGC6820/23 slow cooked*re-done with darks ect*

Recommended Posts

I shot 5 x 30 min subs to add to the 10 x 10 Min's I already had.

Worth the extra effort to get the noise down, although I may just go for another 15 @ 10 Min's rather than 5 @ 30 Min's next time to keep the image tighter.

No darks or flats applied to the new image yet, as the darks are still being collected.

856_thumbnail.jpeg

(10@10 mins+5@30mins )

840_thumbnail.jpeg

(Previous image 10 @ 10 mins)

Mike

Share this post


Link to post
Share on other sites

The difference is very apparent mate..

Nice one...

Share this post


Link to post
Share on other sites

Thanks guys. :(

I have had a chance to redo the processing with Dark, flat and bias frames.

859_thumbnail.jpeg

(click to enlarge)

Share this post


Link to post
Share on other sites

When both of the first two images are 'pulled up'on screen, side-by-side, the reduction in 'noise' is very apparent. Nice work Mike.

BTW, what's causing the 'halo' around the larger stars?

Dave

Share this post


Link to post
Share on other sites

The thoughts on UKAI are that it could be reflection between the ha filter and the ccd coverslip.

I will be looking into it ASAP.

Mike.

Share this post


Link to post
Share on other sites

nice one Mike .nailed it this time i reckon , and yes be nice to rid those halo,s but otherwise a great deep image

Rog :(

Share this post


Link to post
Share on other sites

The thoughts on UKAI are that it could be reflection between the ha filter and the ccd coverslip.

I will be looking into it ASAP.

Mike.

Sounds logical Mike.

It will be interesting to hear what you find.

Dave

Share this post


Link to post
Share on other sites

That's exposure time for you! Nice work Mike. How are you combining the different length subs?

Share this post


Link to post
Share on other sites

Will this mean that the average pixel level corresponds roughly to a 15 min exposure and that potentially accurate pixel values are being lobbed because they are a long way from the mean? I've been wondering about the best way to combine subs of different lengths. I saw a thread on the newccdastro yahoo group in which Ron W suggested combining each of the 2 sets of subs in the usual way and then combining these 2 stacked images using a sum combine. I've never really had to try it but wonder whether it would make any difference.

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.

Sign in to follow this  

  • 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.