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Old 09-07-2021, 10:18 AM
SB (Chris)
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Another Lagoon Nebula

Hi All,
Had another attempt at the Lagoon Nebula,

Taken with Esprit 100, ASI 183 MC and 3.5nm Antlia Ha, Sii and Oiii filters 34 X 300sec each filter. This time I chose not to recolour each filter thus keeping the 'natural' colour of the target.

Stacked and processed in Affinity. Darks, Bias and artificial Flats.

Best

Chris
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Old 09-07-2021, 11:26 AM
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PKay (Peter)
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Very dramatic Chris, I actually like that style, some hate it

If you were to use Pixinsight, you can invert and remove green and then re invert. That can get rid of the magenta stars.
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Old 09-07-2021, 05:47 PM
SB (Chris)
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Originally Posted by PKay View Post
Very dramatic Chris, I actually like that style, some hate it

If you were to use Pixinsight, you can invert and remove green and then re invert. That can get rid of the magenta stars.
Hi Peter,
Thanks for that. Fixed that up as you suggested.

Best

Chris
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Old 09-07-2021, 07:04 PM
raymo
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I don't understand what you mean by the "natural" colour of the target;
the inner part of the Lagoon is largely blue, not orange/red.
raymo
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Old 10-07-2021, 10:01 AM
SB (Chris)
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I don't understand what you mean by the "natural" colour of the target;
the inner part of the Lagoon is largely blue, not orange/red.
raymo
Hi Raymo,
My beginner level understanding is that if the Hubble palate is used the lagoon will indeed look blue in the centre. In this case I did not recolour the filter signals as I was using an OSC with my narrowband filters

The main emissions from M8 are Ha, Sii and Oiii. When Ha and Sii are combined this give a predominately orange/red colour. When I use the Sii filter the signal is strong even with my OSC. So when the orange/red is combined with the Oiii signal it gives a sort of Olive/Green colour in the inner part of M8 (which I moved to a more yellow (artistic licence)).
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Old 10-07-2021, 01:38 PM
AdamJL
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Originally Posted by SB View Post
Hi Raymo,
My beginner level understanding is that if the Hubble palate is used the lagoon will indeed look blue in the centre. In this case I did not recolour the filter signals as I was using an OSC with my narrowband filters
Hi Chris. Not necessarily. I took a picture last year of the Lagoon using the 5D IV last year without filters, just broadband. The centre is blue, mainly because a stock 5D IV doesn't pick up much hydrogen alpha.
https://www.iceinspace.com.au/forum/...85&postcount=5
At the top of that same thread is an image with an OSC with a duoband filter.
So I guess the point is, there is no "natural". We tend to define natural as mimicking the human eye, which a DSLR would be the closest, but it's still not natural or a universal law. Human eyes are incredibly insensitive to a broad spectrum, so this is where the artistic license comes into it that you mention.

If you have a camera that can capture more hydrogen, then the centre becomes less blue and more red (not as red as the edges) because there's not only Oxygen there, but also a lot of Hydrogen. You can process that away by focussing on the Oxygen. There's no right or wrong
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Old 10-07-2021, 02:24 PM
SB (Chris)
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Originally Posted by AdamJL View Post
Hi Chris. Not necessarily. I took a picture last year of the Lagoon using the 5D IV last year without filters, just broadband. The centre is blue, mainly because a stock 5D IV doesn't pick up much hydrogen alpha.
https://www.iceinspace.com.au/forum/...85&postcount=5
At the top of that same thread is an image with an OSC with a duoband filter.
So I guess the point is, there is no "natural". We tend to define natural as mimicking the human eye, which a DSLR would be the closest, but it's still not natural or a universal law. Human eyes are incredibly insensitive to a broad spectrum, so this is where the artistic license comes into it that you mention.

If you have a camera that can capture more hydrogen, then the centre becomes less blue and more red (not as red as the edges) because there's not only Oxygen there, but also a lot of Hydrogen. You can process that away by focussing on the Oxygen. There's no right or wrong
Hi Adam,
Thanks for that.
It wasn't really my intention to get caught up in discussion about M8 colours. I think that's why I put the word Natural in commas as it was a variation away from false colours.

Always good see your posts.

Chris.
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Old 11-07-2021, 12:16 PM
AdamJL
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Apologies, Chris I didn't mean to hijack the thread!

And it's a great shot either way! Clear skies
Adam
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