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The Crescent - several firsts here

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#1 Scott Mitchell

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Posted 09 August 2020 - 08:50 PM

Howdy everyone, I finally got a couple of semi-clear nights over the past week or so. I took the opportunity to grab some time on NGC6888. I had captured this last year with my DSLR and an STC-Duo filter. I was fairly happy with that shot, but I was hopeful that the QHY168C might give me the opportunity to pull out more of the OIII shell around the nebula. Well, the first night was the day after full-moon, so that was asking a bit much. The second night provided better sky, but the combined 6 hours or so of usable exposures from the two night still left me wanting more. Then I went crazy. smile.gif

 

I pulled in the subs from last year into one massive stack. That's the first time I've tried to integrate shots from differing setups; both the cameras and scopes were different here. This also gave me a total of 12 hours of usable exposure time which is the most I've ever integrated by far. 

 

So, I've processed this 6 ways from Sunday by now and need some feedback. The most extreme is done with an eye towards bringing out the OIII as much as possible, but could very well be too much. Then there's a more moderate treatment that still has some of the blue/green tint, and then finally one that is pretty dominated by HA. I'd love opinions on which seems most appropriate. 

 

Here are the shot details and then the various revisions.

 

NGC6888 - The Crescent Nebula

Cameras: QHY168C / Canon T5i (modded)

Scopes: AT65EDQ / William Optics 66SD

Mount: EQ6-R Pro / CEM25P

Exposures: 12 hours of 4 minute subs at  gain 10 / 800 ISO, all auto-guided

   bias, flats, and darks

Filters: Optolong L-Enhance / STC Duo

Software: N.I.N.A, BackyardEOS, PHD2, AstroTortilla, Astro Pixel Processor, Photoshop

 

 

Extreme OIII Accent:

ACtC-3dgoVvnSgQZXf4x0xOTmJAcpsndSOUKUgX-

 

Moderate (Only data from the QHY):

ACtC-3eJI4dqOuD_jeRSru5X9e7J8vMlGBpid59E

 

Conservative/HA dominant (Again just QHY data):

ACtC-3cVFzQ32Yc_BWSuPD8W5ar9hbDvXWJrqvyh

 

 

Let me know what you think! 


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#2 clusterbuster

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Posted 09 August 2020 - 09:01 PM

Pic # 1 gets my vote.

 nice job !

 Mark


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#3 sunnyday

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Posted 09 August 2020 - 09:02 PM

Pic # 1 gets my vote.

 nice job !

 Mark

+1


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#4 OldManSky

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Posted 09 August 2020 - 09:59 PM

I'm different, I guess -- I prefer #2.  But either #1 or #2 would be killer with some work to minimize the OIII halos :)

They're all really nice, Scott.  

Thanks for sharing...and congrats on everything working well!


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#5 Deesk06

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Posted 09 August 2020 - 10:06 PM

#2 has my vote
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#6 Mert

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Posted 10 August 2020 - 01:15 AM

Very nice you've been able to combine all the work done in earlier periods.

Those 12 hours do make a lot of difference.

To me to all the three images look great however my favorite is #1.

As Paul already stated, if you can process those OIII halos out that would

be optimal.

Well done!!

 

Stay well,

Mert


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#7 ac4lt

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Posted 10 August 2020 - 04:55 AM

I like #1, at least at the resolution the forum shows.


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#8 Scott Mitchell

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Posted 10 August 2020 - 06:43 AM

I'm different, I guess -- I prefer #2.  But either #1 or #2 would be killer with some work to minimize the OIII halos smile.gif

They're all really nice, Scott.  

Thanks for sharing...and congrats on everything working well!

Thanks Paul, I see what you're saying about the halos. I'll have to look into some techniques to try to reign them in.

 

Very nice you've been able to combine all the work done in earlier periods.

Those 12 hours do make a lot of difference.

To me to all the three images look great however my favorite is #1.

As Paul already stated, if you can process those OIII halos out that would

be optimal.

Well done!!

 

Stay well,

Mert

Thanks Mert! I was definitely able to go much farther in processing with the 12 hours of data than I was with the initial 3 hours, for sure. 

 

I like #1, at least at the resolution the forum shows.

Thanks Linda, and you've definitely called out something pretty relevant. At full resolution, the noise in #1 is definitely more apparent, I reduced the size by 50% due to the fact that it just doesn't warrant 1:1 inspection.



#9 Scott Mitchell

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Posted 10 August 2020 - 07:09 PM

I'm different, I guess -- I prefer #2.  But either #1 or #2 would be killer with some work to minimize the OIII halos smile.gif

They're all really nice, Scott.  

Thanks for sharing...and congrats on everything working well!

OK, any good pointers for techniques to do this in Photoshop? 



#10 Scott Mitchell

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Posted 10 August 2020 - 07:45 PM

OK, any good pointers for techniques to do this in Photoshop? 

Oh, I think I got it figured out pretty decently with content-aware fill into a new layer and then tweaking the opacity to make it look neutral. Stay tuned for an updated image...



#11 Scott Mitchell

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Posted 10 August 2020 - 07:51 PM

OK, many fewer halos now. Thoughts?

ACtC-3c2rSvq8ZFGBdU78qdtqaPoVGA2FGyNl8B0


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#12 limeyx

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Posted 11 August 2020 - 11:59 AM

+1

I like the highlight detail in #1


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#13 F.Meiresonne

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Posted 11 August 2020 - 12:29 PM

All three are good but #1 i would choose.

 

Personally i would be thrilled if i  could eiher one of those 3grin.gif


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#14 OldManSky

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Posted 11 August 2020 - 12:36 PM

OK, many fewer halos now. Thoughts?

ACtC-3c2rSvq8ZFGBdU78qdtqaPoVGA2FGyNl8B0

Looks great, well done on the halos!


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#15 Scott Mitchell

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Posted 11 August 2020 - 06:14 PM

I like the highlight detail in #1

Thanks limeyx!

 

All three are good but #1 i would choose.

 

Personally i would be thrilled if i  could eiher one of those 3grin.gif

Thanks Freddie!



#16 Scott Mitchell

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Posted 11 August 2020 - 06:17 PM

Looks great, well done on the halos!

Thanks Paul. I appreciate the push to figure that out. I've suffered from those halos for a while not, and I honestly didn't even think about the idea that I might be able to process them out. 

 

By the way, I have followed you observatory journey and am super jealous. It came out really great.




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