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IC 1805 - bortle 5 hazy skies - over 7 hours integration ...

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#1 F.Meiresonne

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Posted 19 September 2021 - 10:53 AM

Hi everyone

 

2 nights not favorable, hazy , second one moon in the sky , lit over 80 percent.
 

 

https://www.cloudyni...11_13344101.png

 

Nice detail though ,especialy the  sparkling birth chamber of stars..at least that is how i see it.

 

Background stars bit less good...ah well..

 

HOO approach, HA in the red channel , OIII and Hb in the green and  blue.. L-enhance 76 mm scope at F/4.5,unmodded  DSLR

 

 

Kinda like it though...

Attached Thumbnails

  • IC1805DNGimp3 (Large).jpg

Edited by F.Meiresonne, 19 September 2021 - 01:14 PM.

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#2 Hypoxic

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Posted 19 September 2021 - 03:11 PM

I like it too. Nice one Freddy!



#3 mackiedlm

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Posted 19 September 2021 - 05:41 PM

That's really nice Freddy. I like the colours very much.



#4 galacticinsomnia

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Posted 19 September 2021 - 06:56 PM

nice capture !

 

Clear Skies !!



#5 F.Meiresonne

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Posted 20 September 2021 - 12:48 AM

Thanks all,

 

Actually for me it is a bit of a record breaker. Never had over 7 hours integration time in an object ...grin.gif.

 

Pity that the skies ware not favorable, but in Belgium that is all too often the case...


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#6 17.5Dob

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Posted 20 September 2021 - 02:28 AM

Nice photo, but I'm wondering about your PP......

THIS is just 3-1/2  hrs on the night of the full moon using an L-Enhance, modded D5300, in a Bortle 5+/6- sky and a 65mm f6.5 scope

What program are you using for post-processing


Edited by 17.5Dob, 20 September 2021 - 02:33 AM.


#7 F.Meiresonne

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Posted 20 September 2021 - 04:26 AM

I use Startools, stacked with DSS, and used GIMP to adjust some coloring.

 

A modded cam like yours off course will be more sensitive to the Ha, my Canon is not modded. There are many pictures on the internet showing alot of Ha nebulosity, but sometimes lacking the detail of the cental cluster .

 

Skies were hazy, on the first night, the second also and moon in the sky.

 

And , if  have seen pictures of you, apperently my processing skils are not at your level either. I found this IC1805  difficult to process

 

I took 2 minutes subs.

 

If you like, i could load up the stack tonight and you could process it, if you wish, always nice to see what others can do



#8 F.Meiresonne

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Posted 20 September 2021 - 01:02 PM

Ok, so for those that might be interested.

 

The stack

 

https://www.dropbox....IC1805.fts?dl=0

 

Always nice to see what more experienced people might come up with.



#9 the Elf

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Posted 20 September 2021 - 04:30 PM

OK, I should go to bed but I could not stop myself from giving it a quick processing.

 

HOO.jpg

 

That's the red and green channel only. I dropped blue.

- split to channels

- remove background

- stretch (arcsinh, HT)

- combine: R = R, G = G, B = 0.15 R + 0.75 G

- saturation

- structure mask from wavelet decomposition (residual)

- local histogram eq.

- star mask

- morphol. star shrink

 

I'd use the mono camera, a separate Ha filter and a separate O-III filter and maybe also shoot some OSC for colored stars. The dual (or more) NB filters are great for bright objects. For fainter ones you soon bump into it's limits. Dark and faint is always relative to the sky background and integration time.

 

But now I do go to bed. Before midnight. Thank god I can sleep long tomorrow, 6am instead of 5am.


Edited by the Elf, 20 September 2021 - 04:35 PM.

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#10 F.Meiresonne

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Posted 20 September 2021 - 11:59 PM

 

 

I'd use the mono camera, a separate Ha filter and a separate O-III filter and maybe also shoot some OSC for colored stars. The dual (or more) NB filters are great for bright objects. For fainter ones you soon bump into it's limits. Dark and faint is always relative to the sky background and integration time.

 

But now I do go to bed. Before midnight. Thank god I can sleep long tomorrow, 6am instead of 5am.

Well that was actually the intention but off course weather interfered. I have a couple of hours of pure OSC too, but no mono stack yet. But i wanted to try the L enhance too. 

 

 

Funny you mention ' the fainter ones' cause some call the IC1805 a bright object. Well i don't. I have my own rule fwiw. If i can't see the object in APT without stretching the image, i call it faint and indeed thisone you can't see. As comparison M101 you do see, at least the core in an unstretched image.

One of my deepsky friends was rather impressed by it cause he is an active visual observer and he remember once in bortle 4 in the Netherlands to try to see it , or a hint of it...He did not succeed, he used an 16 inch newt... to no avail.


Edited by F.Meiresonne, 21 September 2021 - 12:13 AM.


#11 the Elf

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Posted 21 September 2021 - 12:24 AM

 

Funny you mention ' the fainter ones' cause some call the IC1805 a bright object. Well i don't. I have my own rule fwiw.

As I say: Dark and faint is always relative to the sky background and integration time. If you never have more than one night with just a few hours of clear sky the object is too faint.

You can continue adding Ha to the image.

This is my 32x15 min Ha taken with the Askar 180:

Elf_Ha.jpg

 

(this image: https://www.elf-of-l...rtSoul2020.html )

 

I took your data as it is, only removed the background and gave it a simple histogram stretch. Then I used my Ha as luminance. A bit saturatition and brightness, done. Very simple. No single layer work, no tricks, just a bit of local histogram equalization to the Ha prior to applying it to color. 5 minutes processing during my first coffee this morning.

 

Freddy_color_Elf_Ha.jpg

 

So if you pick up 8h of Ha you have the same result.

 

I'm always too shy when it comes to color. Candy version:

 

 


Edited by the Elf, 21 September 2021 - 12:29 AM.

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#12 the Elf

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Posted 21 September 2021 - 12:30 AM

Pop.jpg


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#13 F.Meiresonne

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Posted 21 September 2021 - 12:30 AM

Looks promising indeed. Guess the next step is taking ha. 8 hours that will be 2 nights for sure....for me.

 

But there is still time enough, to catch it the coming weeks...



#14 F.Meiresonne

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Posted 21 September 2021 - 12:41 AM

Do i understand right,you added youre Ha alpha to my  L-enhance stack? Right? So then i could use Ha L to add to the L-enhance stack....



#15 the Elf

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Posted 21 September 2021 - 12:41 AM

BTW: this is what CN user Ohm Eye made from my data:

 

Heart_Soul_by_OhmEye.jpg

 

So if you like that style you might contact him. It is for sure not natural but fascinating in a way.



#16 F.Meiresonne

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Posted 21 September 2021 - 12:45 AM

Much Ha indeed...but o dear that strange orange hueshocked.gif



#17 the Elf

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Posted 21 September 2021 - 12:45 AM

Do i understand right,you added youre Ha alpha to my  L-enhance stack? Right? So then i could use Ha L to add to the L-enhance stack....

Yep. Exactly. Like mono users take R-G-B-L and combine it I used your stack for the RGB and my Ha as L. Did not change anything in the color data. The L data just brightens up the color stack.



#18 F.Meiresonne

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Posted 21 September 2021 - 12:47 AM

Before all this started that was actually my first idea....ok, so definately i know which direction to take...now...



#19 galacticinsomnia

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Posted 21 September 2021 - 02:07 AM

Here is a quick 10 minute edit.
The data looks pretty good.

Siril -

Photometric CC
Asinh Transformation: (stretch=1000.0, bp=0.00100)
Histogram Transf. (mid=0.130, lo=0.130, hi=1.000)

 

Photoshop, stretch, camera raw, light color adjustment, curves, clarity, white balance.

 

IC1805.jpg

 

Clear Skies !!
 


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#20 mackiedlm

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Posted 21 September 2021 - 06:54 AM

Hi Freddy,

 

Thought I'd give this a go in Pixinsight to see if i could get more detail in the core, more visible Oiii and more of the fainter Ha to show.

 

This was a fairly standard PI process and some final teaks on colour in PS

 

Heart3_SCNR_PS.jpg


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#21 the Elf

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Posted 21 September 2021 - 11:04 AM


This was a fairly standard PI process

can you elaborate?

I'm still seeking a standard HOO process in PI. Thank you!
 


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#22 F.Meiresonne

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Posted 21 September 2021 - 12:48 PM

Hi Freddy,

 

Thought I'd give this a go in Pixinsight to see if i could get more detail in the core, more visible Oiii and more of the fainter Ha to show.

 

This was a fairly standard PI process and some final teaks on colour in PS

 

attachicon.gifHeart3_SCNR_PS.jpg

Impressive image. Colors perhaps a bit soso grin.gif  but the detail comes out very strong (and that is what i like afterall the most) and indeed better overall  Ha structure.

 

Quite an achievement imho.


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#23 F.Meiresonne

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Posted 21 September 2021 - 12:49 PM

can you elaborate?

I'm still seeking a standard HOO process in PI. Thank you!
 

Guess for the future HOO will be a bit the way to go, for me. The L-enhance just invites to do so imho, and afterall blue and red are nice ..;grin.gif



#24 mackiedlm

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Posted 21 September 2021 - 03:09 PM

Impressive image. Colors perhaps a bit soso grin.gif  but the detail comes out very strong (and that is what i like afterall the most) and indeed better overall  Ha structure.

 

Quite an achievement imho.

Thanks so much Freddy - colour is such a subjective thing - ask any 3 APers what they like and you'll get 5 different answers. lol.gif

 

But all credit goes to you for the great data capture.


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#25 F.Meiresonne

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Posted 21 September 2021 - 03:31 PM

Thanks so much Freddy - colour is such a subjective thing - ask any 3 APers what they like and you'll get 5 different answers. lol.gif

 

But all credit goes to you for the great data capture.

How did you get so much nebulosity out of it? Did you stretch it further,? Also the overal look is quite more refined...


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