16 replies to this topic

[Juggernaut]

Hi. Of course I'm never satisfied with my poor processing ability but I think I'm making some progress.

 

Skywatcher 250P GoTo Dobsonian.
ASI2600MC
Wanderer Rotator Mini V2
Starizona Nexus 0.75 reducer/coma corrector
Optolong L-Ultimate filter
Bortle 5-6.
Imaged with NINA
Stacked and processed mostly with Siril and then tweaked with GraXpert and layered in PS (thanks Steven Miller & Josh Breezy)
8 second subs for about 9 hours 30 mins
50 bias
25 darks/flats
 

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Edited by Juggernaut, 03 November 2024 - 08:45 PM.

[EGregerson]

Nice;  I'm curious what it would look like without the L Ultimate dual band filter.  i mean, i don't think the blue is from Oxygen.  it's a small star so it doesn't fuse oxygen. ESO VLT has a pic with exotic filters that show it as like lime green & red,  to pick up on the effect of the radiation on the gas.  so i think the gas is just hydrogen & helium mostly; getting intensely radiated by uv. But for some reason its blue light. My dslr also shows it as red and blue light. I was thinking about using my dual band filter but thot the blue would get largely filter out.   

[marvyyk]

Awesome nebula image! 

[Oort Cloud]

Wow!

Both at the picture, and at the thought of processing 4,275 sub-exposures. That's dedication, right there, and it paid off!

I think your processing is pretty good. Maybe a little overcooked, but stark, so I think its kinda worth it.

I, too, am curious what it would like if you did the same thing with just a luminance filter.

[Juggernaut]

Nice;  I'm curious what it would look like without the L Ultimate dual band filter.  i mean, i don't think the blue is from Oxygen.  it's a small star so it doesn't fuse oxygen. ESO VLT has a pic with exotic filters that show it as like lime green & red,  to pick up on the effect of the radiation on the gas.  so i think the gas is just hydrogen & helium mostly; getting intensely radiated by uv. But for some reason its blue light. My dslr also shows it as red and blue light. I was thinking about using my dual band filter but thot the blue would get largely filter out.   

Hi,

I am not sure about the filter.

When I stack it, it actually starts out greenish, but when I "remove green noise" in Siril, it turns blue.

Would it be more natural to leave it the green color?

 

Thanks!

[Juggernaut]

Awesome nebula image! 

Thanks!

[Juggernaut]

Wow!

Both at the picture, and at the thought of processing 4,275 sub-exposures. That's dedication, right there, and it paid off!

I think your processing is pretty good. Maybe a little overcooked, but stark, so I think its kinda worth it.

I, too, am curious what it would like if you did the same thing with just a luminance filter.

Thanks.

Unfortunately my weather isn't good enough to experiment much, so not sure when I would get around to trying without the filter.
When I 1st stack it, it is greenish in color when when I use the "remove green noise" function in Siril it turns blue.

Thanks!

Paul

[Oort Cloud]

Green is normal if you're using a color camera; color balancing is normally one of the first steps you want to do after stacking (definitely before any stretching).

SCNR is best saved until the end, if there is still some green that you couldn't get rid of otherwise during processing (I usually try to "fit" the channels together on the histogram first, as it is not as heavy-handed about removing the green at that point).

Lastly, for best results with a duoband filter, you should be separating the red (H-a) from the green+blue (O-III), rather than debayering. Debayering is meant for broadband data. Siril has an Ha/O-III extract routine that you can run after calibration instead of debayering. This yields 2 sequences, that you then finish (register & stack) individually, which yields 2 monochrome images that you can combine using RGB composition or pixelmath. If you are processing in PixInsight, APP, or some other astro software, there is a probably a routine there that does the same but I can't speak to that.

Edited by Oort Cloud, 04 November 2024 - 01:37 PM.

[epsilon160]

Nice picture Paul. Congrats. I have something to shoot for.

[Juggernaut]

Nice picture Paul. Congrats. I have something to shoot for.

Thanks!

[Juggernaut]

Green is normal if you're using a color camera; color balancing is normally one of the first steps you want to do after stacking (definitely before any stretching).

SCNR is best saved until the end, if there is still some green that you couldn't get rid of otherwise during processing (I usually try to "fit" the channels together on the histogram first, as it is not as heavy-handed about removing the green at that point).

Lastly, for best results with a duoband filter, you should be separating the red (H-a) from the green+blue (O-III), rather than debayering. Debayering is meant for broadband data. Siril has an Ha/O-III extract routine that you can run after calibration instead of debayering. This yields 2 sequences, that you then finish (register & stack) individually, which yields 2 monochrome images that you can combine using RGB composition or pixelmath. If you are processing in PixInsight, APP, or some other astro software, there is a probably a routine there that does the same but I can't speak to that.

Hi,

 

Okay. I have alot to learn as I don't know how to do any of that of which you speak.

I plan to buy pixinsight in the next few months.

Thanks!

Paul

[Oort Cloud]

Hi,

 

Okay. I have alot to learn as I don't know how to do any of that of which you speak.

I plan to buy pixinsight in the next few months.

Thanks!

Paul

You said you stacked it in Siril; did you use a script, or did you do the step-by-step way using the tabs on the right half of the screen?

[Juggernaut]

You said you stacked it in Siril; did you use a script, or did you do the step-by-step way using the tabs on the right half of the screen?

Hi,

I used a script.

thanks.

[Oort Cloud]

There is a Ha/O-III extract script. I don't really know how to run scripts as I haven't done it since I first started using Siril years ago, but you would do whatever you did the first time, and just select that script instead when the data is from your filter.  Instead of a single RGB image, it will yield 2 mono images, one of the Hydrogen, and another of the Oxygen.  Combining them is a little different than what you're used to so far, but not terribly difficult, and once you get comfy, will yield much better results than debayering is capable of.

[Juggernaut]

There is a Ha/O-III extract script. I don't really know how to run scripts as I haven't done it since I first started using Siril years ago, but you would do whatever you did the first time, and just select that script instead when the data is from your filter.  Instead of a single RGB image, it will yield 2 mono images, one of the Hydrogen, and another of the Oxygen.  Combining them is a little different than what you're used to so far, but not terribly difficult, and once you get comfy, will yield much better results than debayering is capable of.

Ok. I will have to check it out.

Thanks!

[Voska]

Hot dang that's a great picture.

Edited by Voska, 06 November 2024 - 09:36 PM.

[Juggernaut]

Hot dang that's a great picture.

Thanks!