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Old 23-05-2022, 09:38 AM
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marc4darkskies (Marcus)
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RCW 75 aka Gum 48a

Latest from Bells Observatory. RCW 75 (aka Gum 48a) is not often imaged. It's quite a challenging target with an ocean of bright stars tending to get in the way of the faint neb. With proper techniques, the impact of the stars can be reduced so the the neb detail pops into view.

In any case, this is my first completed image in over a year (!!) thanks largely to the appalling La Lina weather!! I actually started this way back in 2015 with Ha, adding some more in 2017. With a couple of clear nights earlier this month, I gathered LRGB data. I was definitely a bit rusty, but managed a reasonably decent result I think.

This is a 14.66 hour natural palette LHaRGB image. Lum - 3 hrs (10 min subs), Ha - 5.5Hrs (30 min subs), Red - 2Hrs (10 min subs), Green - 2Hrs (10 min subs), Blue - 2.16Hrs (10 min subs)

Summary details of the object are underneath the images.

Screen sized: https://pbase.com/gailmarc/image/172622000/original
Annotated: https://pbase.com/gailmarc/image/172622003/original
Full res: https://pbase.com/gailmarc/image/165234613/original

Cheers, Marcus

PS: I processed the image in the Adobe RGB colour space and, for best viewing results, they really should be viewed using Firefox or Edge (2nd best) on a calibrated monitor.
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Last edited by marc4darkskies; 23-05-2022 at 11:58 AM.
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  #2  
Old 23-05-2022, 11:14 AM
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My God it's full of stars

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That's a terrific image of a relatively unimaged target, well done!
Q) Is the red saturation turned up a tad too far? Might be losing a spot of detail as a result.
Regardless, welcome back!
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Old 23-05-2022, 11:45 AM
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marc4darkskies (Marcus)
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Quote:
Originally Posted by Andy01 View Post
That's a terrific image of a relatively unimaged target, well done!
Q) Is the red saturation turned up a tad too far? Might be losing a spot of detail as a result.
Regardless, welcome back!
Thanks very much Andy! Nah, don't think so. No (significant) details were harmed during the making of this image!

FYI only, I embedded the Adobe RGB colour profile in this image and it really should be viewed using Firefox or Edge (2nd best) on a calibrated monitor.
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Old 23-05-2022, 12:33 PM
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A great target for your field of view Marcus. There is certainly a lot of Ha activity in this region and well worth chasing down for new targets. I've just checked and RCW 75 is captured within my recent widefield shot centred on Cederblad 122 as well. I can see that it would be a little challenging to process with that busy starfield though I reckon that it has landed in a very good place.
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Old 23-05-2022, 01:01 PM
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A great target for your field of view Marcus. There is certainly a lot of Ha activity in this region and well worth chasing down for new targets. I've just checked and RCW 75 is captured within my recent widefield shot centred on Cederblad 122 as well. I can see that it would be a little challenging to process with that busy starfield though I reckon that it has landed in a very good place.
Thanks Rodney! Ah yes! I see it in your widefield. Indeed, the star field was very challenging to tame. A mix of techniques were used and it took me 5 days of tinkering to get the image to this point. I can tell you that the LRGB master hid what little neb there was behind an ocean of stars!! What you see in the result are, mostly, Ha stars. (FYI, I always add some Lum to my Ha so that the RGB stars have a place to deposit their colour).
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Old 23-05-2022, 01:48 PM
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Beautiful image Marcus. You've tamed that field. The angular resolution is impressive.
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Old 23-05-2022, 05:21 PM
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Woohoo it's clear

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A very pretty field Marcus, nice and welcome back ....I shouldn't be toooo far behind you now...

Mike
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Old 24-05-2022, 10:47 AM
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Great stuff Marcus.

Hopefully the wet weather might start to subside over winter (fingers crossed).
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Old 24-05-2022, 11:46 AM
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That turned out great Marcus. Yes its been very challenging getting any astrophotography time in over the last at least 9 months.

You may've created a new technique there for minimising stars. It's quite effective.

Greg.
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Old 24-05-2022, 12:18 PM
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Quote:
Originally Posted by multiweb View Post
Beautiful image Marcus. You've tamed that field. The angular resolution is impressive.
Thanks very much Marc! The taming (reducing stellar profiles and minimising ugly dark halos) took a fair bit of effort.

Quote:
Originally Posted by strongmanmike View Post
A very pretty field Marcus, nice and welcome back ....I shouldn't be toooo far behind you now...

Mike
Cheers mate!

Quote:
Originally Posted by Retrograde View Post
Great stuff Marcus.

Hopefully the wet weather might start to subside over winter (fingers crossed).
Thanks a lot Pete!

Quote:
Originally Posted by gregbradley View Post
That turned out great Marcus. Yes its been very challenging getting any astrophotography time in over the last at least 9 months.

You may've created a new technique there for minimising stars. It's quite effective.

Greg.
Thanks Greg - glad you liked it! Nah, it's more a case of using several existing techniques as opposed to inventing anything ... combined with the immense skill of the astrophotographer of course!
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Old 25-05-2022, 06:10 PM
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Excellent Marcus, well done!. Only use Chrome, but i dont mind the deep green shades, and green highlights, its different!
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Old 25-05-2022, 07:00 PM
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Excellent Marcus, well done!. Only use Chrome, but i dont mind the deep green shades, and green highlights, its different!
Thanks Fred! Buuut ...what green? I hate green! Aaargh! Are you pulling my leg?
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Old 25-05-2022, 07:08 PM
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Narrowfield rules!

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Thanks Fred! Buuut ...what green? I hate green! Aa argh! Are you pulling my leg?
Yes
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Old 25-05-2022, 07:15 PM
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Yes
You're a cruel, cruel man Fred! <sigh of relief>
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Old 26-05-2022, 07:24 AM
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Lovely image Marcus!
Cheers, Mat
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Old 26-05-2022, 02:36 PM
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Wow. Excellent image, Marcus.


Cheers,
V
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Old 26-05-2022, 02:38 PM
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Lovely image Marcus!
Cheers, Mat
Thanks very much Mathew
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Old 26-05-2022, 02:39 PM
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Wow. Excellent image, Marcus.

Cheers,
V
Thanks Steve!
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Old 26-05-2022, 06:42 PM
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Nice return to the fold Marcus. If you get sick of the cloud over your way we appear to have long absences of the vile stuff over our way.
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Old 27-05-2022, 09:56 AM
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Nice return to the fold Marcus. If you get sick of the cloud over your way we appear to have long absences of the vile stuff over our way.
Thanks Paul. It will eventually improve here.
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