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Start of Sadr Region - Awful Gradient

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#1 rj144

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Posted 22 July 2021 - 01:17 PM

I started a shot of the Sadr region last night.  Even the moon was out, it started fairly far away from the moon, so I tried anyhow.  I took 30 s subs with LP filter from my Bortle 8/9 with a Nikon D750 and zoom lens at 300 mm.  This was a little over 3 hours:

 

sadr-300mm-3hr13minsirimgaff1.jpg

 

Now, I know you're thinking that's overprocessed and missing a lot.  Well, to make it kind of decent, I had to do that because I started with this:

 

badgrad.jpg

 

That's one of the worst gradients I've ever dealt with probably somewhat related to the moon even though it was fairly far away.  And, I still have a bit of that stupid circle in the middle of the image. Anyhow, I'll try to put more time on it and see what happens.



#2 Northrim

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Posted 22 July 2021 - 07:46 PM

Did you take flats and dark flats or Biases?  What did you use to process?


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#3 rj144

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Posted 22 July 2021 - 08:25 PM

Did you take flats and dark flats or Biases?  What did you use to process?

Yes...bias, flats, and darks.  I used DSS, Siril, Imgplus, and Affinity to process.


Edited by rj144, 22 July 2021 - 08:25 PM.


#4 decep

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Posted 22 July 2021 - 08:37 PM

The moon was 95% illuminated last night, you were destined to have a bad time.  Even with 70 degrees of separation the results would not be great.

 

Narrowband is really the only solution in that situation where you *might* come out with acceptable data.


Edited by decep, 22 July 2021 - 08:38 PM.

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#5 dswtan

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Posted 22 July 2021 - 09:38 PM

Not to pile on too much but yes, “…it started fairly far away from the moon, so I tried anyhow.” — this is called a great learning experience. It’s a good thing. :-)


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#6 asf

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Posted 22 July 2021 - 11:22 PM

Well with what you gave me I gave it a go, I'd say I got most of the gradient.... maybe, or maybe its still bad, let me knowbadgrad.jpg badgrad.jpg


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#7 asf

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Posted 22 July 2021 - 11:23 PM

Just a couple more edits: 

 

 

Attached Thumbnails

  • badgrad.jpg

Edited by asf, 22 July 2021 - 11:24 PM.

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#8 rj144

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Posted 23 July 2021 - 12:24 AM

Just a couple more edits: 

Yeah, thanks.  I got something pretty close to that, but there's a lot of noise and color noise in the background with the color image.  I ran this Startools too and got a different result:

 

sadr-300mm-3hr13minstar.jpg

 

Even though my previous attempt is a bit washed out, I like it better.



#9 asf

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Posted 23 July 2021 - 03:59 PM

Do you have the raw color image? just have an idea for processing. (Just stacked, no edits if possible) 



#10 asf

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Posted 23 July 2021 - 04:00 PM

I've dealt with gradients like this before, if you shot at this level of moonlight, instead of DSS use sequator with light pollution reduction, uneven, strong. Might give slightly better results 




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