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Photo

Helix nebula under Brisbane skies

Imaging DSO Astrophotography
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12 replies to this topic

#1 Igor Chekalin

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Posted 17 October 2021 - 06:20 AM

NGC7293, perhaps my main object of this summer "winter", filmed almost every night during its visibility from the balcony. I also have good news that my new cooled mono camera finally arrived, so it's good time to finish and process all the long series I shot with Canon EOS-Ra to the moment.

Canon EOS-Ra DSLR on TAL-250K (10" Klevtsov-Cassegrain) with 0.7x flattner/reducer (NPZ MkII), mount Skywatcher EQ6R-Pro Balcony in Brisbane, Australia (Toowong, Bortle-7 sky).

 

1359 x 1 min RGB
1285 min by 5 and 10 min subexposures with H-alpla filter (Antlia 3nm), mostly taken under the Moon
1000 min by 10 min subs with O-III filter (Antlia 3nm)

Total 3644 min (60 hours 44 minutes) of exposures taken during 32 nights in 2021:
31 of July, 04, 05, 06, 07, 11, 15, 16, 19, 21, 27, 28, 29 of August 06, 07, 08, 09, 10, 11, 13, 14, 14, 15, 16, 17, 22, 23, 24, 25, 02, 03, 04 of September.

 

Big image (click to zoom):

https://www.astrobin.../full/q3eltn/0/

Big starless image:
https://www.astrobin.../full/q3eltn/D/

Stars was removed by Continuum Substraction method, residual artifacts was retouched in PS. not a single neural network was injured.

Software: APT, DSS, Iris, FITStacker, Photoshop

 

gallery_33373_3136_9252245.jpg

Attached Thumbnails

  • ngc7293_TAL250K_EOSRa_60h_HORGB_BNE_size50_starless_500kb.jpg

  • Diego, F.Meiresonne, nofxrx and 33 others like this

#2 vkhastro1

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Posted 17 October 2021 - 07:00 AM

Amazing photo !



#3 F.Meiresonne

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Posted 17 October 2021 - 07:06 AM

Mindblowing picture!

 

So is the integration time...phew!



#4 sterec

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Posted 17 October 2021 - 07:23 AM

It is an incredible picture.



#5 Alen K

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Posted 17 October 2021 - 07:28 AM

Superb!

#6 Steve OK

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Posted 17 October 2021 - 08:59 AM

Just beautiful!  A good payoff for the time spent.

 

Steve



#7 crackout

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Posted 17 October 2021 - 09:56 AM

Amazing!
Having that much integration time under the hood, have you tried stretching a little more to reveal more of the faint nebulosity?

#8 deansjc

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Posted 17 October 2021 - 10:58 AM

I look forward to seeing this image in an award winning list!  Fabulous.  Do enter it!!



#9 Igor Chekalin

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Posted 17 October 2021 - 10:58 AM

Thank you very much mates for your kind words! smile.gif
 

Amazing!
Having that much integration time under the hood, have you tried stretching a little more to reveal more of the faint nebulosity?

Of course, I tweaked it different ways during post-proc., I think starless version on AstroBin reveals close to the maximum.

But generally I try to adhere to the rule that if noise reduction artifacts attract attention at 100% scale, then I have gone too far, and I need to take a step back. The same applies to artifacts of other post-processing methods. So I think the best way to reveal more is to increase initial S/N ratio by going under dark skies, accumulating more subs or upgrade for better equipment. 



#10 Traveler

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Posted 17 October 2021 - 11:56 AM

Very best Helix. Congrats!



#11 MHamburg

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Posted 17 October 2021 - 04:03 PM

And you still call yourself an amateur!bow.gif

Michael



#12 Aquat0ne

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Posted 18 October 2021 - 02:43 AM

Stunning. Love it.

#13 abcdefghii

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Posted 18 October 2021 - 09:42 AM

Wow. That is absolutely amazing. I can't tell which I like more, with stars or without, both are incredible.




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