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  #1  
Old 09-07-2013, 10:50 PM
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RickS (Rick)
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NGC6559 et al from Ten Chain Hill

After having high hopes for last Saturday night after a lovely clear day, the clouds started to move in as I finished polar alignment. Despite the conditions I imaged anyway with Maxim beeping plaintively to complain of lost guide stars.

It cleared up around midnight and I awoke to find the data wasn't a complete disaster (thanks to ACP for looking after things while I got some shuteye). I'm not unhappy with the results although some may think my processing a little over the top. I'm still wondering if I went a bit too far myself

This was my first outing to dark skies with the Ceravolo 300 Astrograph and I'd have to call it a success since I came home with an image. With the weather we've been having in SE Qld that's no mean feat.

Scope: Ceravolo C300 @ f/4.9 = 1470mm FL, Atlas focuser
Mount: AP900
Camera: U16M
Filters: Astrodon E series Gen 2 LRGB
Guiding: Lodestar / MMOAG
Image scale: 1.26 arcsec/pixel
Exposures: 12x200s R, 12x300s G, 12x300s B, 36x300s Lum (6 hours)

Attached below are images of:
- the complete FOV
- NGC6559, IC4685, B302, B303
- IC1274

Larger versions are here:
http://rickstevenson.smugmug.com/Ast..._ps_med-X3.jpg
http://rickstevenson.smugmug.com/Ast...ps_crop-X3.jpg
http://rickstevenson.smugmug.com/Ast...ps_crop-X3.jpg

Constructive criticism appreciated.

Thanks,
Rick.
Attached Thumbnails
Click for full-size image (NGC6559_v4_ps_sml.jpg)
192.4 KB66 views
Click for full-size image (NGC6559_v4_ps_crop_sml.jpg)
149.5 KB65 views
Click for full-size image (IC1274_v4_ps_crop_sml.jpg)
177.4 KB55 views

Last edited by RickS; 11-07-2013 at 08:38 PM. Reason: Repro images
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  #2  
Old 10-07-2013, 05:10 AM
Stevec35 (Steve)
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Hi Rick

A very nice looking image! I'm no expert in colour balance but there seems to be a bit too much cyan on my monitor though.

Cheers

Steve
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Old 10-07-2013, 08:10 AM
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multiweb (Marc)
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Love the details. Unreal image scale. Blue's and red's are white clipped though. Due for a redo. But still a great pic.
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Old 10-07-2013, 10:22 AM
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Thanks, Steve & Marc. I used a new technique for processing the RGB that might need some tweaking. I will revisit the data tonight.
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Old 10-07-2013, 10:31 AM
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One of my favourite areas on the night sky. What I like is your detail and smooth background. Perhaps a little too much cyan and the orange stars have a little too much cyan in my opinion. Other than that the image looks good. Besides you can always add more data to it and improve the colour.
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Old 10-07-2013, 11:01 AM
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I will offer that this scope in your hands has great potential! I had a chance to test a prototype a few years ago and was very impressed with its simple and elegant approach to design and collimation. Looking forward to more images.
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Old 10-07-2013, 11:43 AM
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Rick, the difference between the first cut you did up here at 10Chain and the images you've posted is dramatic. I see how well you have brought out those fringing blues, the dark dust lanes and those intense bands of hydrogen - demonstrating why this region is on so many 'favourite' lists. Well done.

Peter
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Old 10-07-2013, 01:15 PM
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Quote:
Originally Posted by Paul Haese View Post
One of my favourite areas on the night sky. What I like is your detail and smooth background. Perhaps a little too much cyan and the orange stars have a little too much cyan in my opinion. Other than that the image looks good. Besides you can always add more data to it and improve the colour.
Thanks, Paul!

Quote:
Originally Posted by dvj View Post
I will offer that this scope in your hands has great potential! I had a chance to test a prototype a few years ago and was very impressed with its simple and elegant approach to design and collimation. Looking forward to more images.
Thanks, John. It is a lovely piece of gear.

Quote:
Originally Posted by pmrid View Post
Rick, the difference between the first cut you did up here at 10Chain and the images you've posted is dramatic. I see how well you have brought out those fringing blues, the dark dust lanes and those intense bands of hydrogen - demonstrating why this region is on so many 'favourite' lists. Well done.
Thanks, Peter. I'm very happy with what I've squeezed out of the Luminance. Now I just need to get the colour right.

Cheers,
Rick.
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  #9  
Old 10-07-2013, 06:49 PM
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ozstronomer (Geoff)
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Nice result Rick, glad the clouds finally cleared to a good night.
That scope is really producing some excellent results

Geoff
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Old 10-07-2013, 07:01 PM
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Thanks, Geoff. Hope you got some nice data up at Crows Nest.

The white clipping of the blue and red that Marc noticed is proving interesting to figure out. It's mostly "caused" by the conversion to sRGB that I do at the end of my processing. I guess it's an out of gamut thing. Looks like I have some more work to do to figure out the best way to deal with this...
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Old 10-07-2013, 07:04 PM
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Wish I could have been there to see the gear in use.
Colours a little too technicolour for my taste Rick, but no doubting there's quality data in there. Wondeful shots for your efforts.
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Old 10-07-2013, 08:36 PM
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Thanks, Rob. I'm willing to admit the current version is a bit OTT I'm working to tone it down to almost tasteful levels.
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Old 11-07-2013, 01:26 AM
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Beautiful effort, Rick! The reds/pinks/purples/golds look fantastic... but the cyan is certainly new That's some serious photon gathering kit How is the Neumann Camera Tilting Unit working out?
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Old 11-07-2013, 03:34 PM
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jjjnettie (Jeanette)
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I simply love this region of the sky. Looking forward very much to seeing the repro.
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  #15  
Old 11-07-2013, 08:44 PM
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tilbrook@rbe.ne (Justin Tilbrook)
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Wow Rick!

In your larger versions they are stunning, the cyan stars actually good too.
Love the resolution of you rig.

Cheers,

Justin.
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  #16  
Old 11-07-2013, 08:47 PM
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Thanks for the feedback, everybody! Repro versions here:
http://rickstevenson.smugmug.com/Ast..._ps_med-X3.jpg
http://rickstevenson.smugmug.com/Ast...ps_crop-X3.jpg
http://rickstevenson.smugmug.com/Ast...ps_crop-X3.jpg

There were some interesting things happening in the processing of the colour data that I still need to figure out. I had to desaturate a couple of times (reduce CIE c* with curves) to prevent white clipping the red and blue channels when I converted to sRGB. Perhaps NGC6559 should be called the out-of-gamut nebula

Quote:
Originally Posted by naskies View Post
Beautiful effort, Rick! The reds/pinks/purples/golds look fantastic... but the cyan is certainly new That's some serious photon gathering kit How is the Neumann Camera Tilting Unit working out?
Thanks, Dave. I'm hoping the gear will work even better on a good night! I haven't made much progress with the CTU. I managed to damage one of the adjustment screws using a ball head allan key at an odd angle so I had to wait for a replacement. It arrived yesterday.

Quote:
Originally Posted by jjjnettie View Post
I simply love this region of the sky. Looking forward very much to seeing the repro.
Thanks, JJJ! Hope you like it! I'm very fond of this area as well. So much cool stuff. I'll probably try again at 2700mm when I get a chance.

Cheers,
Rick.
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  #17  
Old 11-07-2013, 10:12 PM
Ross G
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Great looking photo Rick.

Amazing detail and colour.

What a beautiful object!

Ross.
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  #18  
Old 11-07-2013, 10:22 PM
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marc4darkskies (Marcus)
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You've got to be happy with that! Great detail and natural colour. Very nicely done Rick!

Cheers, Marcus
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  #19  
Old 11-07-2013, 11:20 PM
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Unreal & spectacular capturing Rick Dig the colours, and amaizing details, a facinating area of sky, must make note of this target, I like it !
Great work & show
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Old 12-07-2013, 09:24 AM
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RickS (Rick)
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Quote:
Originally Posted by Ross G View Post
Great looking photo Rick.

Amazing detail and colour.

What a beautiful object!

Ross.
Thanks, Ross.

Quote:
Originally Posted by marc4darkskies View Post
You've got to be happy with that! Great detail and natural colour. Very nicely done Rick!

Cheers, Marcus
Thank you, Marcus. The scope is working well. I just need to keep working on the processing skills!

Quote:
Originally Posted by astronobob View Post
Unreal & spectacular capturing Rick Dig the colours, and amaizing details, a facinating area of sky, must make note of this target, I like it !
Great work & show
Thanks, Bob. Would love to see what you can do with this target too!
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