Jump to content

sgl_imaging_challenge_banner_31.thumb.jpg.b7a41d6a0fa4e315f57ea3e240acf140.jpg

Strange things on my images!


Recommended Posts

Hi, first time posting here!

The last two images I took had strange blue/grey rings on them. Not sure what's caused them.

I'm using a Canon 1100d with an Evostar 72ed with a lens warmer. Wondered if the sensor needed cleaning? Or if I shouldn't be using the warmer during Summer?

These rings only come to light when processing after stacking. Was kind of hoping I'd discovered two black holes ūüėĀ

Any help appreciated!

 

andromeda2.jpeg

Edited by CheapAsAstronomer
Extra info
Link to post
Share on other sites

You've massively black clipped the data so we don't have a view of everything captured by the camera but this is very strange. What's needed is a link to the linear stack. (Stacked with no processing.)

Olly

Link to post
Share on other sites
50 minutes ago, ollypenrice said:

You've massively black clipped the data so we don't have a view of everything captured by the camera but this is very strange. What's needed is a link to the linear stack. (Stacked with no processing.)

Olly

Ah. I'm on it.

Link to post
Share on other sites

Try stacking the images without the flats and see if you still have the problem. 

I just downloaded  the file you posted and it looks like a problem with your flats.

 

 

Edited by CCD-Freak
  • Thanks 1
Link to post
Share on other sites
34 minutes ago, david_taurus83 said:

Some people swear by that method, I havr found it under exposes for my 6D. How did you stack and process your light frames?

Stacked in DSS using recommended settings and processed in Startools, again with recommended settings

Link to post
Share on other sites

Hi,

Crop away the stacking artifacts around the edges and fix your flats (these are almost definitely dust donuts). If you cannot (or don't want to) fix the flats, mask out the dust specks before running Wipe. Have a look at the Wipe documentation here which incidentally shows examples of the same issue you are experiencing above.

Hope this helps!

Link to post
Share on other sites
3 hours ago, jager945 said:

Hi,

Crop away the stacking artifacts around the edges and fix your flats (these are almost definitely dust donuts). If you cannot (or don't want to) fix the flats, mask out the dust specks before running Wipe. Have a look at the Wipe documentation here which incidentally shows examples of the same issue you are experiencing above.

Hope this helps!

Excellent! Thank you!

Link to post
Share on other sites
13 minutes ago, CheapAsAstronomer said:

There is a chance it could have....not sure if it did. 

Try taking a couple more flats at the proper focus to see if the dust donuts are in the same place. If they are then take another set and try them for calibration.

Link to post
Share on other sites
  • 2 months later...

Late to to the post .. but Ive created a video with APP for the stacking and then processing in Star Tools for M31 with the exact same camera that you have.

Please let me know if the video was helpful, I'm already working on further objects and workflows via You Tube. So please subscribe to be notified as they appear !

https://www.youtube.com/watch?v=xxkDDLspaiM

Link to post
Share on other sites
  • 5 months later...
On 13/10/2020 at 19:56, autonm said:

Late to to the post .. but Ive created a video with APP for the stacking and then processing in Star Tools for M31 with the exact same camera that you have.

Please let me know if the video was helpful, I'm already working on further objects and workflows via You Tube. So please subscribe to be notified as they appear !

https://www.youtube.com/watch?v=xxkDDLspaiM

Great video. Learned many things there!

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.

√ó
√ó
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.