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Old 21-08-2015, 08:20 PM
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Rod771 (Rod)
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M17 - Swan nebula

Been a while since I've had some new data to process. June and July new moons where either clouded out or work commitments dictated early bed times. This month proved to be different.

This is my first shot of M17 at my long FL configuration. Ended up with 86 x 4 minute subs imaged over three nights.

Imaged with the C11 Edge HD with .7x focal reducer (1960mm FL) F7.
Mount - CGEM DX
Canon 60Da @ ISO 800

Integration, 5 hours 44 minutes in total.

Calibrated with darks and flats, processed in Pixinsight.

Large click here

Full click here

Thanks for looking

Cheers

Rod
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Last edited by Rod771; 26-08-2015 at 08:08 PM.
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  #2  
Old 21-08-2015, 08:42 PM
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tilbrook@rbe.ne (Justin Tilbrook)
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Nice Rod!

Some great detail in the centre of the Swan.

Cheers,

Justin.
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  #3  
Old 21-08-2015, 10:17 PM
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Stunning Rod. I like it a lot. Great colours and really nice detail in the Neb.
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Old 21-08-2015, 10:31 PM
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Beautifully done !
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Old 21-08-2015, 10:57 PM
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DJScotty (Scott)
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Stunning image. Superb detail and colors.
Love it
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Old 21-08-2015, 11:14 PM
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That is a pretty slick Omega there Rod. Good detail and star colour looks good too. Maybe the nebulosity looks a little brown, but there is lots to like. Nice smooth back ground too. Well done
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Old 21-08-2015, 11:17 PM
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strongmanmike (Michael)
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Really good Rod! What a vista, I like seeing the Swan in this orientation, anything else looks wrong or upside down to me

MINOR POINT...The wavelet/sharpening ie bright thin lines, is still juuust visible though ..maybe a slight re-blend to satisfy my obsessive compulsive wavelet/decon phobia....please? ...or, just ignore me

Mike
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Old 22-08-2015, 07:35 AM
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multiweb (Marc)
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Great shot Rod. Nice image scale. Tight stars and beaute colors. One for the cool wall.
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  #9  
Old 22-08-2015, 09:34 AM
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Top marks Rod. You are creating excellent imagery.

Rob
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  #10  
Old 23-08-2015, 07:39 PM
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Quote:
Originally Posted by tilbrook@rbe.ne View Post
Nice Rod!

Some great detail in the centre of the Swan.

Cheers,

Justin.
Thanks Justin! I was pretty please with it.

Quote:
Originally Posted by Rex View Post
Stunning Rod. I like it a lot. Great colours and really nice detail in the Neb.
Cheers Rex! Glad you like it mate.

Quote:
Originally Posted by Somnium View Post
Beautifully done !
Thanks Aidan!

Quote:
Originally Posted by DJScotty View Post
Stunning image. Superb detail and colors.
Love it
Thanks Scotty, It was good to have some new data to play with after a couple of months.

Quote:
Originally Posted by Paul Haese View Post
That is a pretty slick Omega there Rod. Good detail and star colour looks good too. Maybe the nebulosity looks a little brown, but there is lots to like. Nice smooth back ground too. Well done
Thanks very much Paul! I normally just go with what ever PI's colour cal comes up with but with this one, I pushed the red channel in curves a bit to showcase a bit data/signal. Perhaps I pushed it a touch to far creating the brown?

Quote:
Originally Posted by strongmanmike View Post
Really good Rod! What a vista, I like seeing the Swan in this orientation, anything else looks wrong or upside down to me

MINOR POINT...The wavelet/sharpening ie bright thin lines, is still juuust visible though ..maybe a slight re-blend to satisfy my obsessive compulsive wavelet/decon phobia....please? ...or, just ignore me

Mike
Thanks Mike! Yeah I get dizzy when M17 is in any other position.

Ah yes You know what Mike, every time I include my decon routine in the work flow, I have a little Mike Sidonio sitting on my shoulder whispering "That's too many iterations, back it off a bit or he'll notice" I did also do some wavelet sharpening at the end too, maybe that was too much?

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Originally Posted by multiweb View Post
Great shot Rod. Nice image scale. Tight stars and beaute colors. One for the cool wall.
Thanks Marc! Yeah the stars are getting better I think? I have noticed I have a bit of backlash in RA that I could probably tighten up mechanically, which may help guiding and results in future. The full image is a 50% resample of the full res and the biggest resolution I've posted, so I'm slowly gaining confidence in data acquisition and processing.

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Originally Posted by RobC View Post
Top marks Rod. You are creating excellent imagery.

Rob
Cheers Rob! Really enjoying it at the moment. Thanks for the support.
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  #11  
Old 24-08-2015, 09:16 AM
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Quote:
Originally Posted by Rod771 View Post
Thanks Mike! Yeah I get dizzy when M17 is in any other position.

Ah yes You know what Mike, every time I include my decon routine in the work flow, I have a little Mike Sidonio sitting on my shoulder whispering "That's too many iterations, back it off a bit or he'll notice" I did also do some wavelet sharpening at the end too, maybe that was too much?
Sorry, it is more my problem than yours I think Rod , there are plenty out there that wouldn't even notice . I just think detail needs to be real and not manufactured, wavelettes and decon do manufacture pseudo detail if not very careful. If you can see thin bright wiggly lines or tiny uniform dot like detail...it's a dead give away. It is only subtly noticeable in this image anyway.

Now...where's my straight jacket

Mike
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  #12  
Old 24-08-2015, 11:12 AM
RobC (Rob)
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Quote:
Originally Posted by strongmanmike View Post
Sorry, it is more my problem than yours I think Rod , there are plenty out there that wouldn't even notice . I just think detail needs to be real and not manufactured, wavelettes and decon do manufacture pseudo detail if not very careful. If you can see thin bright wiggly lines or tiny uniform dot like detail...it's a dead give away. It is only subtly noticeable in this image anyway.

Now...where's my straight jacket

Mike

Mike - Curiosity has got the better of me. Please draws some arrows on Rod's image to show where the wiggly lines or tiny uniform dot are created by the deconvolution processing.

Thanks

Rob
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  #13  
Old 24-08-2015, 01:54 PM
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Uhh … I can’t see the wiggly lines or tiny uniform dots; my spectacles must be out of date …
But without them what I can see is a really fine M17
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  #14  
Old 24-08-2015, 02:24 PM
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No need for me to draw arrows all over Rod's image, the effect I notice is only subtle and I'm not going to subject his Swan to disfigurement by pointing out some minor artefacts in her feathers, if you can't see'em then that's good . Besides, I think Rod knows what I am saying, the image is really quite good and my observations were of something fairly trivial and my comments were just friendly and light-hearted

Mike
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  #15  
Old 24-08-2015, 02:43 PM
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I can't see any either. Must be like jets.
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  #16  
Old 24-08-2015, 03:27 PM
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I can't see any either. Must be like jets.
Or noise
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  #17  
Old 24-08-2015, 03:55 PM
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Wow, that is an excellent image!! Great work
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  #18  
Old 24-08-2015, 04:28 PM
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Nice work Rod. Good wide field and lots of sharp detail. I would push the saturation a bit more, but I guess that comes down to personal preference.
Geoff
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  #19  
Old 24-08-2015, 09:16 PM
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Rod771 (Rod)
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Quote:
Originally Posted by IanP View Post
Uhh … I can’t see the wiggly lines or tiny uniform dots; my spectacles must be out of date …
But without them what I can see is a really fine M17
Thanks Ian

Quote:
Originally Posted by pluto View Post
Wow, that is an excellent image!! Great work
Cheers Hugh!

Quote:
Originally Posted by ghsmith45 View Post
Nice work Rod. Good wide field and lots of sharp detail. I would push the saturation a bit more, but I guess that comes down to personal preference.
Geoff
Cheers Geoff!

Thanks for the feedback. I must admit I'm conservative (or indecisive) when adjusting colour saturation.
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  #20  
Old 24-08-2015, 09:21 PM
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Rod771 (Rod)
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Quote:
Originally Posted by strongmanmike View Post
my observations were of something fairly trivial and my comments were just friendly and light-hearted

Mike
And that's the way they were taken, Mike! I always appreciate any feedback and definitely enjoy your humor . I think we're on the same page there.
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