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Astrophotography and Sketching >> CCD Imaging & Processing

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Tyler Allred
scholastic sledgehammer


Reged: 10/28/08

Loc: Utah, USA
NGC6888-Supernova Astrograph-Nocturne Observatory new
      #5952176 - 07/02/13 10:19 PM Attachment (43 downloads)

Hello All. Here is a new version of the Crescent Nebula NGC6888. This was captured with my homemade 12.5" Zambuto "Supernova Astrograph". This is a combination of LRGB and narrowband data. I have attached a 66% version, but the full version is also worth a look. Details on the image are also available on the website. The narrowband data were captured using 20-minute exposures, binned 2x2.

[CLICK HERE TO SEE THE THE FULL VERSION ON MY WEBSITE]


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David PavlichAdministrator
Transmographied
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Reged: 05/18/05

Loc: Mandeville, LA USA
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: Tyler Allred]
      #5952202 - 07/02/13 10:33 PM

Really neat image, Tyler!!

David


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Jim Thommes
Post Laureate
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Reged: 09/20/04

Loc: San DiegoCA USA
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: David Pavlich]
      #5952273 - 07/02/13 11:20 PM

Oh WOW. Lovely image Tyler.

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stephane zoll
super member


Reged: 09/11/11

Loc: Grenoble, France
Re: NGC6888-Supernova Astrograph-Nocturne Observatory [Re: Jim Thommes]
      #5952533 - 07/03/13 04:56 AM

very nice !

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bill w
Postmaster
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Reged: 03/26/05

Loc: southern california
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: stephane zoll]
      #5953443 - 07/03/13 04:44 PM

great shot
love the nice deep OIII envelope


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jaddbd
professor emeritus


Reged: 05/18/05

Loc: Woodbine, MD
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: bill w]
      #5954372 - 07/04/13 06:38 AM

Nice Tyler!

John D


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Tyler Allred
scholastic sledgehammer


Reged: 10/28/08

Loc: Utah, USA
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: jaddbd]
      #5954907 - 07/04/13 03:19 PM

Thanks to David, Jim, and Stephane, for taking time to comment.

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Tyler Allred
scholastic sledgehammer


Reged: 10/28/08

Loc: Utah, USA
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: bill w]
      #5954909 - 07/04/13 03:22 PM

Quote:

great shot
love the nice deep OIII envelope



Thanks a lot Bill. It really made a difference shooting this with 20 minute exposures and also binning the camera 2x2. The OIII envelope really popped out and made the processing much easier. I may try this approach again on narrowband data.


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Tyler Allred
scholastic sledgehammer


Reged: 10/28/08

Loc: Utah, USA
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: jaddbd]
      #5954912 - 07/04/13 03:23 PM

Thanks for the comment John.

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JoseBorrero
Post Laureate
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Reged: 09/04/09

Loc: Puerto Rico Island
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: Tyler Allred]
      #5955077 - 07/04/13 06:01 PM

wow cool!

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astrovienna
Carpal Tunnel


Reged: 12/04/06

Loc: The NoVa White Zone
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: JoseBorrero]
      #5955844 - 07/05/13 10:35 AM

Very nice, Tyler. Every image I see of the Crescent looks completely different from the last one. The version on your website with the Soap Bubble is pretty cool too.

What's the image scale here? Binning seems right since it looks like an unbinned image would be pretty heavily oversampled. Did you use only the RGB for color, or is the Ha/OIII in the color data as well?

Kevin


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DeanS
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Reged: 07/12/05

Loc: Central Kentucky
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: astrovienna]
      #5955970 - 07/05/13 11:45 AM

Great image Tyler. What bandwidth are you using for the NB?

Dean


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Tyler Allred
scholastic sledgehammer


Reged: 10/28/08

Loc: Utah, USA
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: astrovienna]
      #5956298 - 07/05/13 04:02 PM

Quote:

Very nice, Tyler. Every image I see of the Crescent looks completely different from the last one. The version on your website with the Soap Bubble is pretty cool too.

What's the image scale here? Binning seems right since it looks like an unbinned image would be pretty heavily oversampled. Did you use only the RGB for color, or is the Ha/OIII in the color data as well?

Kevin



Thanks Kevin. My unbinned image scale is at roughly 0.74 arcseconds/pixel, so I guess binned is roughly 1.5 arcseconds/pixel. The binning sure helped with the depth of the image, and my skies are not usually very stable, so I don't gain much by shooting unbinned except on the best nights.

I actually did all the color processing with the OIII and Ha data, and just added in the RGB for star color. For the most part, this is a synthetic color image with some RGB added in for stars. Now that I look closely at the image, I could have done better with the saturation level of the stars. It seems they still look a bit like a typical bi-color image, but they are not terrible.

Thanks for your interest in the image.


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Tyler Allred
scholastic sledgehammer


Reged: 10/28/08

Loc: Utah, USA
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: JoseBorrero]
      #5956317 - 07/05/13 04:12 PM

Thanks Jose.
Cheers,
Tyler


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Tyler Allred
scholastic sledgehammer


Reged: 10/28/08

Loc: Utah, USA
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: DeanS]
      #5956340 - 07/05/13 04:25 PM

Quote:

Great image Tyler. What bandwidth are you using for the NB?

Dean



Thanks Dean. My FLI CFW-2-7 is filled with 50mm Astrodon Gen II LRGB filters and 50mm Astrodon 6nm narrowband filters (Ha, OIII, SII).

A while back I had a 1.25" 13nm Ha filter that I loved. It still seemed to cut the light pollution quite well, but it was so much faster to get good image depth. I know the current trend is for narrower filters, and perhaps the contrast is better that way, but only if you have enormous amounts of time to spend imaging. Many of the great images use very narrow filters, but most of those seem to be coming from remote observatories where integration times are 20-40 hours. With my skies, it would take me a month or more to get that much data. For me, the wider bandwidth is a good thing.


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Tyler Allred
scholastic sledgehammer


Reged: 10/28/08

Loc: Utah, USA
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: DeanS]
      #5960328 - 07/08/13 10:56 AM

Quote:

Great image Tyler. What bandwidth are you using for the NB?

Dean



By the way... I hope your weather improves. Mine has been terrible for a while, with thunderstorms and clouds every evening. I wake up and it is perfectly clear, but most of the night it is lousy. It seems like summer should be better than this has been.


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atalas
Carpal Tunnel


Reged: 02/21/05

Loc: Sydney,Australia
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: Tyler Allred]
      #5964480 - 07/10/13 05:51 PM

Wonderful work Tyler!

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JWalk
Pooh-Bah


Reged: 06/06/10

Loc: San Antonio, TX
Re: NGC6888-Supernova Astrograph-Nocturne Observatory new [Re: atalas]
      #5964718 - 07/10/13 08:46 PM

Good work on the 03.

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