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View Full Version here: : The Lagoon Nebula (M8), The Trifid Nebula (M20) and M21 in Sagittarius


Octane
11-08-2018, 11:16 PM
Hi all,

Full resolution image available here (http://scratch.hqphotography.com.au/m8m20x.html).

Note: this is the full resolution image and as such it might be difficult to view in your browser; right-click the image and select View Image to make it fit in your browser window.

This was data that I was capturing while working on another mosaic.

This was also my first time in blending hydrogen alpha data in to the luminance, as well as into the red and blue channels. I think it has turned out nicely.

Target: The Lagoon Nebula (M8), The Trifid Nebula (M20) and M21 in Sagittarius
Date(s): 2018; July: 2nd, 3rd, 4th, 5th, 8th, 9th, 10th, 11th, 13th, 14th and 15th
Location: Gordon, ACT, Australia
Detector: SBIG STL-11000M at -20 degrees Celsius
Telescope: Takahashi FSQ-106N
Focal length: 530mm
Mount: Losmandy G-11 (Gemini)
Guide scope: Takahashi FS-60CB
Guide camera: SBIG Remote Guide Head
Exposure: Nebula L(Ha)R(Ha)GB(Ha) (120 120 120 120 720); total: 20 hours in 300 second subexposures for LRGB and 1800 second subexposures for Ha
Exposure: LRGBHa bin 1x1
Software: MaxIm DL 5, CCD Commander, FocusMax, PinPoint, PixInsight and Photoshop

Comments, critique, etc., most welcome.

Thank you for looking.

H

Placidus
12-08-2018, 05:19 AM
Joyous! So much to see!

Nice gentle processing. It looks even better if one sets the dark point a tad darker.

Bravo!

MnT

leon
12-08-2018, 08:11 AM
A work of art H, I like it a lot such a beautiful widefield well done indeed.

Leon

cometcatcher
12-08-2018, 09:19 AM
That's a great image to pan and look around.

gregbradley
12-08-2018, 09:45 AM
Great work Humi. A favourite of the sky and very nicely done.

Greg.

Andy01
12-08-2018, 11:15 AM
Nicely done H, delicate & subtle - well done! :thumbsup:

atalas
12-08-2018, 03:22 PM
Wonderful work H:thumbsup: :thumbsup: :thumbsup: this field never gets tiring....everyone has their own take on It, and It's always interesting taking the tour.

Stevec35
12-08-2018, 03:36 PM
Nicely done indeed. It could probably benefit from a bit more contrast but it's still an excellent rendition of this grouping.

Steve

RickS
12-08-2018, 03:57 PM
I'll look forward to the completed mosaic, H! The image looks great. One minor nit is the partial bad column (look near the small PN in NGC 6559.)

Cheers,
Rick.

multiweb
12-08-2018, 04:46 PM
Good to see some pics from you. :thumbsup::thumbsup::thumbsup: Turned out very nice. I have the same issue on my QHY9 with a recent bad column so I'd be interested to hear how PI gets rid of it. I suspect CosmeticCorrection and use a dark as the rejection map? Rick probably can chime in. :question: Otherwise impute rejected pixels in CCD Stack paints the black pixels and holes left behind with neighbouring ones.

troypiggo
12-08-2018, 05:13 PM
Awesome. Nice blend.

RickS
12-08-2018, 05:25 PM
You can set up a defect map with CosmeticCorrection. I use a few 16803 cameras that have developed shedloads of bad columns over time and it works a treat with a little dithering.

multiweb
13-08-2018, 07:51 AM
Will give it a go. :thumbsup:

SimmoW
13-08-2018, 08:04 AM
Yeah, pity about the lines, CC will fix that. Lovely subtle version of the famous pair!

Geoff45
13-08-2018, 03:55 PM
Superb image Humayan. I love the way that these wide field images bring out the relationships between all those objects which are often separately imaged.
Geoff

petershah
13-08-2018, 04:22 PM
Lovely work....love your processing :thumbsup:

Octane
19-08-2018, 08:14 PM
Thank you, everyone, for your lovely comments. My apologies for the late reply; I’ve been without mobile reception as I went 4WD through the Flinders Ranges and then across the desert up north. Will be back home tomorrow. No photography on this trip. I just needed to get away and soak it all in.

The bad columns are from using a 2-3 year old superbias frame. The sensor has deteriorated since then. I’ll make a fresh one soon.