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.

jjosefsen

[Solved]Could this be an issue with my Oiii filter?

Recommended Posts

Hi,

I'm working with some recent data of a new(ish) camera, and my Ha data is pretty good, but the oiii has these strange artifacts around the borders.

If I use any kind of local normalization then it pretty much ruins most of the image, as you can see below..

First the Ha:

image.thumb.png.6511d1cc8b3cfe0ac4553d3d3035a39b.png

 

Oiii with local normalization:

image.thumb.png.0a1b5603fe3e94cab1c2a019e1fe5872.png

 

oiii local normalization map, see how it fits with the artifacts:

image.thumb.png.4b8cf8f1bddc44d94c94df26a9fc0887.png

 

Oiii without any local normalization:

image.thumb.png.fd964cc67de039692a8a2a0bb35bb6c4.png

 

These edge artifacts, could they be related to a bad filter or is it a processing artifact, has anyone seen anything similar?

 

I am using Astro Pixel Processor for calibration and stacking.. Im kind of stumped on this one, and I am going to yank out the Oiii filter this weekend to have a looksie.

Edited by jjosefsen
  • Like 1

Share this post


Link to post
Share on other sites

It looks more like a stacking artifact due to field rotation during your imaging session. 

Have you tried cropping the edges before running normalisation? 

Share this post


Link to post
Share on other sites
3 hours ago, Xplode said:

Can you see any of it on your raw images?

No I can't. At least not in a normal stretch.

Share this post


Link to post
Share on other sites
31 minutes ago, geordie85 said:

It looks more like a stacking artifact due to field rotation during your imaging session. 

Have you tried cropping the edges before running normalisation? 

No - but I suppose I can do that somehow as a batch process.

It is just strange that it doesn't happen in my Ha stack as well.

Share this post


Link to post
Share on other sites

Problem solved!

It was due to stacking artifacts introduced by APP.

When those were resolved, the normalization issues were gone. :)

  • Like 2

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Corpze
      Hi, I just published a video of how I am cleaning my filters - I thought I might do this while my telescope is back at service due to some kind of astigmatism.
      How do you guys clean your filters? it seems that every dust particle finds it way to the filters just as you are done cleaning them, and to sit in a damp bathroom seems kind of a mess...

      Anyway, here is the video
      / Daniel
       
       
    • By Anthony RS
      Selling the Astronomik 12nm clip in Ha filter for 120€. Bought it for 270 usd including vat, customs and shipping so it's a really good price.

      The filter is still in excellent condition, used only twice. No fingerprints, no scratches not even dust (image attached).

      I will also handle the shipping through my post office without cost. If another shipping method is requested, then we'll have to to discuss the price.

      Contact me if interested.

      Clear Skies,
      Anthony

    • By Anthony RS
      SOLD
      Selling the filter for 70€ . Original price around 230$ (including shipping, vat and customs).

      The filter is in excellent condition, used only 3 times. No fingerprints, no scratches no dust (image attached).

      I will also handle the shipping through my post office without cost. If another shipping method is requested, then we'll have to to discuss the price.
      Contact me if interested.

      Clear Skies,
      Anthony

    • By Kitsunegari
      Here in the United States, most of our children are on some type of remote learning program due to yada yada.   During processing my images and helping out the kids, some mumblings of " the color purple would look neat."  was heard over my shoulder...
       
       
       
       
       
       

    • By yltansg
      Hi,
      I would like to share with you an article written by me on high-resolution solar imaging in different wavelengths.  Glad that the European Physics Journal (EPJ) Web of Conferences published it. You can read it at:   

      https://www.epj-conferences.org/articles/epjconf/abs/2020/16/epjconf_seaan2020_01002/epjconf_seaan2020_01002.html
      You can see the different layers of the Sun in high-resolution images using different setups.  
       
      Best regards.
      Alfred 
×
×
  • Create New...

Important Information

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