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  #1  
Old 19-04-2012, 10:28 AM
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NGC6357 narrow band

This object has been on my redo list for 4 years now and I am finally getting around to doing the data collection on it. This is an intial image but there needs to be another two session at least to make this image what I have in mind. For now the colours are fairly reasonable but I want more of the hubble palette look to it.

Click here for larger image

Feel free to comment or critique.
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Last edited by Paul Haese; 19-04-2012 at 05:52 PM.
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Old 19-04-2012, 11:44 AM
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Love the colour of the neb. 6357 is dead boring in LRGB so this is a very nice way of presenting it. It looks very interesting in NB.

The magenta stars, whilst a Hubble way of doing things isn't that appealling. Have a look at selective colours tool and see what you think:

Magenta

cyan +60%
magenta -100%

Blues
Yellow +60%
back +60%

See what you think.

Which filter is giving the reflection halos?

Greg.
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  #3  
Old 19-04-2012, 11:58 AM
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Will take a look at that Greg, thanks for the tip.

The reflection is on all three. I might have to send Astronomiks an email and see if I can get mine exchanged. I could use the halo reduction though in the final image and prevent stop the problem.
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Old 19-04-2012, 12:06 PM
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Uploaded with your suggestions Greg. Looks pretty good, thanks for the tip.
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  #5  
Old 19-04-2012, 12:23 PM
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It's on my re-do list as well....a very a faint bugger and hard to do justice to.

I like your latest rendition a lot
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  #6  
Old 19-04-2012, 02:46 PM
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Very nice Paul not overpowering
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  #7  
Old 19-04-2012, 06:43 PM
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Thanks guys. Yes a tough one, but one with lots of interesting detail. A real good one for NB.
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Old 19-04-2012, 07:37 PM
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Very cool indeed Paul, excellent.
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  #9  
Old 19-04-2012, 07:47 PM
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What a lovely shot Paul ,heaps of detail in there,cant recall seeing this one before looking forward to more data .
AL
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Old 19-04-2012, 08:03 PM
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Will be interesting to see where you go with this Paul. Already looking very striking. Not one I have any experience with - the "War and Peace neb" I gather.
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Old 19-04-2012, 08:10 PM
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Thanks guys, appreciated.

Alan, there are some great examples on the net of this object. Martin did this several years ago with striking results. It appears to be a great narrow band target.

Rob, yep it is the "War and Peace" neb.
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  #12  
Old 19-04-2012, 09:49 PM
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A striking image Paul. Lovelly structure.

Darrin...
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  #13  
Old 19-04-2012, 11:12 PM
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Love the detail in the nebula but not the light violet/magenta bright stars - an unavoidable part of NB imaging?
Minor gripe as it is a great image
Doug
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Old 20-04-2012, 12:50 AM
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Great result with lots of detail and interesting texture. Even though the lobster is a little billious in colour, I'm pleased to have been present at it's birth. The halos are quite substantial for not especially bright stars.
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  #15  
Old 20-04-2012, 08:37 AM
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Thanks guys.

Quote:
Originally Posted by dugnsuz View Post
Love the detail in the nebula but not the light violet/magenta bright stars - an unavoidable part of NB imaging?
Minor gripe as it is a great image
Doug
For Hubble palette alone I think it is unavoidable. I will eventually include RGB for star colour and this will for the most part remove the problem. At least I think so.
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  #16  
Old 20-04-2012, 09:34 AM
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Very good detailed image Paul.

I am not at all an expert on combining NB data but my years at Kodak where they drummed colour theory that is basically human vision response to light is still with me.

Magenta stars tells me the stars in the red and blue channels are far too bright for the green channel. This is most probably due to getting the SII (red) and OIII (blue) nebulosity up to near the level of the HA (green). This is the Hubble pallette?

The continuum filter that Astrodon sell would solve this problem by just subtracting some star intensity from SII and OIII NB data before combining with HA NB data.

Have I got this correct or am I just dreaming?

By the way in additive colour, magenta is the absence of green. Have a look at a colour negative and all the trees and green plants are magenta!

Bert

Last edited by avandonk; 20-04-2012 at 09:51 AM.
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  #17  
Old 20-04-2012, 10:21 AM
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Don't think I've ever seen this nebula in narrowband before Paul and I like your treatment of it. I suppose the magenta stars are a minor distraction but they don't detract from a very nice image. With RGB stars I think you're going to have a real winner.

Cheers

Steve
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  #18  
Old 20-04-2012, 01:44 PM
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I can see him!
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  #19  
Old 20-04-2012, 02:25 PM
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Paul,

Its a good effort and an intersting object, however the image is still very noisy. There is something very funky going on with the stars, not talking about the magenta aspect of them but the different halo sizes. This could be CA?

I think to improve this image, you may need to devote either more time in processing or longer subs to try and stabilise the noise.

Cheers
Mark
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  #20  
Old 20-04-2012, 03:24 PM
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Paul,
I really like the colours too.
Yes there is some noise there, but you've stretched it to the max so we can see some really faint stuff, so I guess that's to be expected.
Overall, quite a good image :-)
James
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