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First go at processing (Ring Nebula)

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#1 bry73

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Posted 25 September 2021 - 09:40 PM

OK, I have been mostly just doing EAA but decided to go ahead and process my shots and see if can pull out more detail.

My Equipment is a Meade LX85 Mount, Sky Watcher Quattro 8" F4 Newtonian, Explore Scientific Coma Corrector, Canon 60D EOS,

ZWO 120C guide camera and a Astro-Tech 60mm guide scope. Where I live  is a Bortle 7 sky.

 

Ring Nebula from 163, 30 second frames, ISO800. Stacked using Deep Sky Stacker and then post processed using GIMP

Attached Thumbnails

  • Ring Nebula 9_24_21.jpg

Edited by bry73, 25 September 2021 - 09:48 PM.

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#2 EPinNC

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Posted 26 September 2021 - 10:09 AM

This is a great "first go" ! waytogo.gif   It's a fun target, and a bit challenging from Bortle 7 skies.  (I have similar conditions -- typical suburban environment street/porch lights and big shopping centers nearby).

 

I'm still a novice at this stuff, but I think you've got better data here than it appears.  163 x 30s should be plenty for bringing out the main features of M57.  I would suggest two things:

 

(1)  Check your focus.  Your stars seem just a little bit soft.  I have a 102mm Maksutov-Cassegrain, and mine look similar, but that's to be expected for a small scope with a relatively large central obstruction.  Maybe that's as good as you can get, I don't know.  Just seems like an 8" scope should do better than mine.

 

(2)  The main thing:  You should look for some feature in your software called "photometric color calibration."  You have a heavy blue-purple cast, and that's only because your histogram shows blues considerably brighter than reds and greens.  Here's GIMP's histogram of your image, using a logarithmic scale to spread the color curves out:

 

histogram-log-scale.jpg

 

I use Siril, and it has a feature for this calibration, wherein it compares your image with a standardized image on one of several different websites and adjusts your color curves accordingly:

 

pcc.png

 

I tend to use the "Simbad" online database, but probably others would work fine too.  I suspect Deep Sky Stacker has a similar feature.  I think once you fix that, you'll be happier with the image.

 

Looking forward to seeing more!  Thanks for sharing!

 

 

 


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#3 bry73

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Posted 02 October 2021 - 12:17 AM

EPinNC, Thanks for the feed back, this is the type of information needed to help bring things to the next level.




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