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Processing using Siril and Photoshop of a fairly recently discovered object

DSO Astrophotography Imaging Software
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#1 Martin Schoenmaker

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Posted 22 June 2022 - 03:13 PM

I have been working on a Hubble Palette image of the Crescent nebula. I was however after an object which lies very close to this nebula, but was only discovered in 2008. Fairly recently in my book.

I was very stoked to see it already in the Hydrogen-alpha data after stacking. But I knew from other images that this object should shine blue, so I had my hopes on [OIII].

 

Using my William Optics GT81 telescope, the Flat6A III 0.8x reducer, the ASI2600MM Pro camera (mono) and a filterwheel with S, H and O filters I got to this result.

Crescent SHO Final CN.jpg

 

In order to show how I reached this result I screenrecorded the processing. With all the explanatory talking it turned out to be pretty long. So I decided to split it in two parts and share it on YouTube.

I am certain that I did things in ways that could be improved. Please feel free to post your feedback. 

 

By the way, yes I know I should have shot darks... ;-)

Part 1: Using Siril to stack everything.

https://www.youtube....h?v=lihYh83bfJY

 

Part 2: Using Starnet++ to remove the stars and Photoshop to put everything together (and re-add the stars).

https://www.youtube....h?v=BBy7VDx6xjw


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#2 Martin Schoenmaker

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Posted 22 June 2022 - 03:14 PM

I should've added that it was about the Soap Bubble nebula, which is to the left of the Crescent. See this crop:
Crescent SHO Final cropped CN.jpg


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#3 Skysmacker

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Posted 22 June 2022 - 03:32 PM

Fantastic work! That is amazing!

 

I am about to begin my foray into narrowband. I also use SiriL so I really appreciate the videos in this post!

 

Thanks for sharing!


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#4 SimRacingGarage

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Posted 22 June 2022 - 05:34 PM

Awesome videos! I have saved them in my YouTube Astrophotography play list. Just getting started, so this helps a lot.


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#5 Martin Schoenmaker

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Posted 23 June 2022 - 03:54 AM

Two things I would like to improve in my image are the noise levels and the stars.

 

I think the first needs to be solved by adding more data. But also I was reminded that by adding proper darks to the processing I would be able to lessen the noise.

 

The stars I'd like to fix by also shooting some RGB data on this object. I can then extract the RGB stars and paste them into this narrowband data.



#6 Oort Cloud

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Posted 23 June 2022 - 01:06 PM

Two things I would like to improve in my image are the noise levels and the stars.

I think the first needs to be solved by adding more data. But also I was reminded that by adding proper darks to the processing I would be able to lessen the noise.

The stars I'd like to fix by also shooting some RGB data on this object. I can then extract the RGB stars and paste them into this narrowband data.


Darks are a waste of time with that sensor if you dither, since it doesn't have any amp glow. Others will surely disagree on this, but I am not the only one using a 5xx sensor that stopped using darks for this reason.
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#7 Martin Schoenmaker

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Posted 24 June 2022 - 02:48 PM

Darks are a waste of time with that sensor if you dither, since it doesn't have any amp glow. Others will surely disagree on this, but I am not the only one using a 5xx sensor that stopped using darks for this reason.

That was my firm believe as well. I am using dithering (of course). Anyway, this was shot in astro-twilight mostly (no astro-dark for some time over here) and not that many subs. I contribute the noise mostly to that.




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