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NGC6888-Supernova Astrograph-Nocturne Observatory

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#1 Tyler Allred

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Posted 02 July 2013 - 09:19 PM

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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#2 David Pavlich

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Posted 02 July 2013 - 09:33 PM

Really neat image, Tyler!!

David

#3 Jim Thommes

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Posted 02 July 2013 - 10:20 PM

Oh WOW. Lovely image Tyler.

#4 stephane zoll

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Posted 03 July 2013 - 03:56 AM

very nice !

#5 bill w

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Posted 03 July 2013 - 03:44 PM

great shot
love the nice deep OIII envelope

#6 jaddbd

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Posted 04 July 2013 - 05:38 AM

Nice Tyler!

John D

#7 Tyler Allred

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Posted 04 July 2013 - 02:19 PM

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

#8 Tyler Allred

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Posted 04 July 2013 - 02:22 PM

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.

#9 Tyler Allred

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Posted 04 July 2013 - 02:23 PM

Thanks for the comment John.

#10 JoseBorrero

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Posted 04 July 2013 - 05:01 PM

wow cool! :waytogo:

#11 astrovienna

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Posted 05 July 2013 - 09:35 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

#12 DeanS

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Posted 05 July 2013 - 10:45 AM

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

Dean

#13 Tyler Allred

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Posted 05 July 2013 - 03:02 PM

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.

#14 Tyler Allred

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Posted 05 July 2013 - 03:12 PM

Thanks Jose.
Cheers,
Tyler

#15 Tyler Allred

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Posted 05 July 2013 - 03:25 PM

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.

#16 Tyler Allred

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Posted 08 July 2013 - 09:56 AM

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.

#17 atalas

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Posted 10 July 2013 - 04:51 PM

Wonderful work Tyler!

#18 JWalk

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Posted 10 July 2013 - 07:46 PM

Good work on the 03.






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