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Astrophotography

Posted: 22 Aug 2019 14:53
by A-L-E-X
Wow, narrowband really cuts through the light pollution!  I think you also need to shoot a fourth one for the Luminance channel.

Astrophotography

Posted: 22 Aug 2019 18:11
by Phunnie
A-L-E-X wrote:
Wow, narrowband really cuts through the light pollution!  I think you also need to shoot a fourth one for the Luminance channel.

You only need luminance for RGB shots! You can't see the nebulosity with luminance as it doesn't cut out light pollution.

Astrophotography

Posted: 23 Aug 2019 12:57
by A-L-E-X
Phunnie wrote:
A-L-E-X wrote:
Wow, narrowband really cuts through the light pollution!  I think you also need to shoot a fourth one for the Luminance channel.

You only need luminance for RGB shots! You can't see the nebulosity with luminance as it doesn't cut out light pollution.

Oh, thats a good point, but I also heard you can use a regular light pollution filter or (better) an imaging light pollution filter (which corrects the white balance) for the luminance channel.  I wonder if that does anything for narrowband imaging?

Astrophotography

Posted: 23 Aug 2019 19:39
by Phunnie
A-L-E-X wrote:
Phunnie wrote:
A-L-E-X wrote:
Wow, narrowband really cuts through the light pollution!  I think you also need to shoot a fourth one for the Luminance channel.

You only need luminance for RGB shots! You can't see the nebulosity with luminance as it doesn't cut out light pollution.

Oh, thats a good point, but I also heard you can use a regular light pollution filter or (better) an imaging light pollution filter (which corrects the white balance) for the luminance channel.  I wonder if that does anything for narrowband imaging?

LP filters as luminance can help immensely for normal LRGB composites, but for narrowband it does more harm than good. The signal is nowhere near as close as narrowband. You can also use the Ha filter as luminance and make sweet HaRGB composites.

Astrophotography

Posted: 25 Aug 2019 14:16
by Phunnie
Welp, got bored and decided to do a Bicolor Ha & OIII blend while waiting for SII dataImage

Astrophotography

Posted: 25 Aug 2019 23:15
by A-L-E-X
omg and this is in a light polluted area?  There's a site called astrobin you should start a collection on there

Astrophotography

Posted: 26 Aug 2019 00:19
by Phunnie
A-L-E-X wrote:
omg and this is in a light polluted area? 

Yup, bortle 8. Light pollution is visible to the naked eye without taking long exposures. It's pretty bad, which is why I went narrowband.


There's a site called astrobin you should start a collection on there

I will, but right now I need a lot more experience with post processing. Just switched to PixInsight so I'm completely new to the processing methods. I gave the SHO palette a try nonetheless...
Image
Total about 9 hours of integration time (3 hours with each filter)

Astrophotography

Posted: 26 Aug 2019 03:39
by vlad01
Wow that's outstanding, great job. 

Would love to do something like that one day myself. I live in bortle 3 skies, used to be between somewhere from 1-2 20 years ago though :(  Oh light pollution, how much I love you.

Astrophotography

Posted: 26 Aug 2019 21:51
by Phunnie
Well, did a few modifications and darkened the dust. It's still nowhere near perfect, but it is what it is. I'll probably come back to it at a later time with more knowledge in processing.
Image

In the meantime, I've decided to take my last clear night for a while to start on a new target!

NGC 7000 / North America Nebula
Image

Astrophotography

Posted: 27 Aug 2019 19:37
by Watsisname
That is an incredible result, Phunnie.  I absolutely love that color palette. :)

Last night I also did some astrophotography, though not with such nice equipment.  A quiet, beautiful night under the stars in the North Cascades, with the Canon Rebel T3 and a tripod.

Image

Astrophotography

Posted: 27 Aug 2019 21:37
by Phunnie
Wow.
I really wish I had darker skies. That looks amazing. I've never even seen the milky way in my life. Darkest skies I've ever been under and actually looked up was somewhere around Bortle 6. I've been in a Bortle 1 area a few years ago during a camping trip, but I was too tired to look up and went straight to sleep :( Many regrets. 


A quiet, beautiful night under the stars in the North Cascades, with the Canon Rebel T3 and a tripod.

Untracked? Holy ***.

Astrophotography

Posted: 28 Aug 2019 00:46
by Salvo
Phunnie wrote:
Wow.
I really wish I had darker skies.

Same, I live right in the middle of most polluted sky area of Italy. Luckily there are a few mountains around and there the sky is acceptable, but not enough for seeing the Milky Way though.

Astrophotography

Posted: 30 Aug 2019 01:49
by vlad01
I plan to go out for a hiking trip end of next month to the Grampians here in Aus, which is on the very edge between 0 and 1 skies so way darker than where I am.  My mate and I will try for some photos.

Astrophotography

Posted: 30 Aug 2019 03:04
by A-L-E-X
Phunnie wrote:
Wow.
I really wish I had darker skies. That looks amazing. I've never even seen the milky way in my life. Darkest skies I've ever been under and actually looked up was somewhere around Bortle 6. I've been in a Bortle 1 area a few years ago during a camping trip, but I was too tired to look up and went straight to sleep :( Many regrets. 


A quiet, beautiful night under the stars in the North Cascades, with the Canon Rebel T3 and a tripod.

Untracked? Holy ***.

Wow, untracked?  The longest exposures I can do with the stars still appearing like points is 15 seconds, which coincidentally, seems to be about the longest I can do without light pollution becoming prevalent (and still preserving star colors.)
There's a free tool to remove light pollution called Sequator, you should try it!

Astrophotography

Posted: 30 Aug 2019 06:18
by Phunnie
HOO bicolor blend of NGC 7000 / North America Nebula.
35x300" Ha
35x300" OIII
Image

There's a free tool to remove light pollution called Sequator, you should try it!

I'd be against using some automatic tool like Sequator. I've tried it myself and it kinda works, but I found that I get better results by just removing LP manually.