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Another Crescent Nebula


paul
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Hi All,

This is my first image of this season after a long break. It's the result of two nights of roughly 1hr total for LRGB, 2hrs Ha and 5hrs Oiii. 

I've been practicing with methods to combine the images...

The first image uses the Pixinsight NBRGBombination script. This is over all balanced but underwhelming for the NB.

The second is a composite of an LRGB image and HOO image produced in Pixinsight then combined in Paintshop Pro. This shows the Oiii more clearly but I find the red a bit intense.

LRGB subs were 30sec @ gain 0, Ha and Oiii susb were 120sec @ gain 200. ASi1600mm pro and filter set, scope was the OO250 newt. Even at 30 seconds and 0 gain I still manage to clip some stars.

 

I suspect I have some light leakage in my flats so I may re-take those or I may just crop it out  😉.

NGC6888_NBRGBcombination.png

NHC6888_Ha_Oiii_LRGB.png

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Thanks Peter, Paul. It was my first of this type, understanding how the work flow affects the final look so dramatically is quite a challenge but its fun.  I think there is more to get of this data yet so I will continue reading and experimenting.

 

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This is my final, final version honest 😄. This process combined stretched  LRGB+ starmask with a stretched HOO using pixelmath and final colour correction.

For me this is easier on the eye and visually more interesting and somewhere between the previous two.

I need to move on now...

 

NHC6888_Ha_Oiii_LRGB_v2.png

Edited by paul
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16 hours ago, paul said:

This is my final, final version honest 😄. This process combined stretched  LRGB+ starmask with a stretched HOO using pixelmath and final colour correction.

For me this is easier on the eye and visually more interesting and somewhere between the previous two.

I need to move on now...

 

NHC6888_Ha_Oiii_LRGB_v2.png

This is the best, it is better colour balanced and shows the Oiii more clearly than the earlier "red" version.

 

Well done. 

 

Carole 

Edited by Carastro
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3 hours ago, Sterrenland said:

Love this last version best... amazing detail of the nebulosity/gases around the edge. Have only tried the Crescent once before with my old DSLR... you've made me add it to my list of future targets with the new camera!

Thanks, it's the most complex processing I've done on a target. 

I couldn't leave it and I've done a new round of processing and improved the stars and ringing artifacts, its looking more subtle now.

 

I am convinced I have some artifacts in my lights that aren't in any other images. It seems I have some stray light hitting the bottom corners. My flats look good but there is definitely clouding visible in my Ha and Oiii lights.  

NGC6888_LRGB_HOO_PM v2.png

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