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  #1  
Old 19-07-2018, 06:59 PM
furgle (Adam)
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Location: Brisbane
Posts: 118
Cats Paw Nebula

Image:

  • 72x 600s Sulphur-II 6nm
  • 97x 600s Hydrogen-alpha 6nm
  • 73x 600s Oxygen-III 6nm
Total integration 40 hours 20 minutes.
Hardware:

  • Skywatcher Black Diamond 80ED
  • Skywatcher EQ8 Pro mount
  • QSI 683-ws8 Camera @ -15C
  • Astronomik 6nm Hα, OIII, SII filters
  • Starlight Xpress Lodestar X2 Autoguider
  • Innovations Foresight On Axis Guider
  • Starlight Instruments Focus Boss II
Location:

  • Orange zone in Brisbane, Australia. (Bortle 7)
  • Imaged over 8 nights.
Software:

  • Planning & camera alignment with Aladin 10
  • Captured with TheSkyX Professional
  • Guiding with PHD2
  • FocusLock live focusing
  • PixInsight: Calibration, sub-frame analysis, registration, integration, dynamic background extraction, noise reduction, histogram transformation, HDR multiscale transform, curves, star reduction, rotation, crop.
Higher resolution here: http://observatory.site/astrophotogr...ts_Paw_Nebula/
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Click for full-size image (NGC6334 IIS.jpg)
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  #2  
Old 19-07-2018, 09:19 PM
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Andy01 (Andy)
My God it's full of stars

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Location: Melbourne
Posts: 1,873
40+ hrs? Wow, Herculean effort- looks great on my phone, well done! [/LIST]
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  #3  
Old 20-07-2018, 08:12 PM
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SimmoW (SIMON)
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Join Date: Jan 2014
Location: Tamleugh, Victoria, Australia
Posts: 1,282
Very nice and yes a huge effort! Nice colours.

For 40hrs, I would have expected a smoother result. Maybe it's been sharpened too much?
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  #4  
Old 21-07-2018, 07:55 AM
Placidus (Mike and Trish)
Narrowing the band

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Join Date: Mar 2011
Location: Euchareena, NSW
Posts: 2,841
Hi, Adam,

Looks like you've got some joyously good data there.

I feel that it's over-processed. The background is too pushed, causing the main target to become weak and posterized. Perhaps the HDR step is the main culprit, but also too strong a curve. It's also too saturated, again tending to produce posterization. Narrowband images don't normally need the saturation to be touched at all.

If you do push the background less, the main subject will seem more contrasty and you won't need to sharpen it so much.

I'd strongly recommend you have another go using a more gentle touch, not trying to bring out the background so much, but aiming to let the main subject speak for itself, because the underlying data look really tops. Very nicely acquired.

Hope I'm being useful rather than obnoxious.

Very best,
Mike
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  #5  
Old 21-07-2018, 07:58 AM
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Atmos (Colin)
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40 hours is a super effort!
It looks quite good but I do tend to agree with Mike. Very nice and clean data to play with
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  #6  
Old 21-07-2018, 09:25 AM
furgle (Adam)
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Location: Brisbane
Posts: 118
Thanks guys. I always appreciate the feedback. I just realised pixinsight has not been using my darks, so that may be some of the problem with noise. I wrote some software to interface all my systems together and it writes the fits header, so now I need to work out which keywords are causing the issue.

I'm going to have another go at this data. Hopefully a better result the next time round.
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  #7  
Old 21-07-2018, 12:02 PM
Placidus (Mike and Trish)
Narrowing the band

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Location: Euchareena, NSW
Posts: 2,841
Quote:
Originally Posted by furgle View Post
... I wrote some software to interface all my systems together and it writes the fits header ...
An astrophotographer after my own heart !

Mike
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