Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_30_second_exp_2.thumb.jpg.7719b6f2fbecda044d407d8aba503777.jpg

gnomus

Cygnus Wall in SHO (Hubble Palette)

Recommended Posts

The summer has proven challenging weather-wise here in the UK.  The original plan was for 5 hours each of SII, Ha and OIII on this object.  I got pretty close to completion last night before the clouds rolled in.  I have decided to call it therefore, even though I am still 4 subs short of target.  This is my Esprit 120, with QSI 690 atop a Mesu 200 in my home observatory.   

Data captured between 27 May and 19 August 2017 and consists of:

  • Ha: 18x1200"
  • OIII: 13x1200"
  • SII: 13x1200"

For a total of 14.7 hours

Data was then brutalised using PI and PS.

Cygnus_Wall_FINx1920.thumb.jpg.98c9283c63ece655816fbf7e2b9a915d.jpg 

Edited by gnomus
  • Like 19

Share this post


Link to post
Share on other sites

Great image. I like the way you framed the contrasting clouds, with the black clouds looming over the bright Wall. You could experiment with making the orange in the Wall a bit brighter, to enhance the effect even more. Just a thought.

  • Thanks 1

Share this post


Link to post
Share on other sites
35 minutes ago, wimvb said:

Great image. I like the way you framed the contrasting clouds, with the black clouds looming over the bright Wall. You could experiment with making the orange in the Wall a bit brighter, to enhance the effect even more. Just a thought.

Thanks Wim.  It is very interesting to hear folks' different perspectives.  In fact, I originally had an even more 'insipid' version than the one posted.  It was @MrsGnomus who persuaded me to amp things up a bit.  I will keep playing around with it (as I do with all of them :icon_biggrin:).  Increasingly I find myself leaning toward less contrast and less saturation.  That is probably because I am a somewhat dull , grey and wishy-washy kind of person. 

Share this post


Link to post
Share on other sites
4 hours ago, wimvb said:

Great image. I like the way you framed the contrasting clouds, with the black clouds looming over the bright Wall. You could experiment with making the orange in the Wall a bit brighter, to enhance the effect even more. Just a thought.

Thanks for making me go back and look at this again, Wim.  I found quite a bit wrong with it.  Somehow I'd lost a lot of fine detail in the wispy black stuff.  And I do think that a little boost to the gold colours helps....  

02_Cygnus_FIN_FINx1920.thumb.jpg.3687ead0b22dafceb84f605f6ed362c7.jpg

Share this post


Link to post
Share on other sites

I'm not a sophisticated commentator on NB images but it has the small scale finesse which comes with that turf and is entrely free from magenta star haloes and other nasties - so I think it's a winner!

Olly

  • Thanks 1

Share this post


Link to post
Share on other sites

Much better stars, and fine detail in the whispy black clouds. There is a delicate balance between the black 'tendrils' and light coming from the rusty clouds. But the main body of the black cloud has become a bit too solid in the second version, imo.

Sorry, if I am too critical, it is a stunning image. This is an image where I can visualise a final version, but I don't think I would be able to take it there.

  • Thanks 1

Share this post


Link to post
Share on other sites

No Wim, I'm pleased you made me look again.  The tendrils (and some other parts of the image) had become smeared almost as if I had run some blunderbuss noise reduction over everything.  I had done some NR but thought I had carefully masked everything, so not sure what went awry.  

Anyway, I'm much happier with V2.

Steve

Share this post


Link to post
Share on other sites
3 hours ago, wimvb said:

Much better stars, and fine detail in the whispy black clouds. There is a delicate balance between the black 'tendrils' and light coming from the rusty clouds. But the main body of the black cloud has become a bit too solid in the second version, imo.

Sorry, if I am too critical, it is a stunning image. This is an image where I can visualise a final version, but I don't think I would be able to take it there.

Is this what you had in mind?

03_Cygnus_FIN_FINx1920.thumb.jpg.7420ca80be873663b0612a8fbfba669a.jpg

Share this post


Link to post
Share on other sites

In fact - I think I am happier with this new version.  I decided to extract a Lum layer from my SHO (RGB) image.  I could then be bolder with the colours without mucking up the star colours.  Of course the detail then comes from the separately worked on Lum layer.  

B_Cygnus_FINx1920.thumb.jpg.e4d15c03165beeff635e76f3019ad93c.jpg

  • Like 6

Share this post


Link to post
Share on other sites

Woah! You've really done something special there. You've achieved a perspective that makes it clear the dark areas sit in front, not behind the illuminated areas, with the stars sitting in front of these. Love it.

  • Like 1
  • Thanks 1

Share this post


Link to post
Share on other sites

Yes, it's matter and it's dark. Therefore it is dark matter.

Share this post


Link to post
Share on other sites

Beautifully done.  Actually I was going to congratulate you for your gentle touch on the saturation of the first image which I really like.  However I also like the extra detail you have extracted subsequently and you've still not gone to town with the saturation so ticks all my boxes!

  • Thanks 1

Share this post


Link to post
Share on other sites

Thank you Martin.  I agree about the tendency to push saturation (and other things) too far sometimes.  

Share this post


Link to post
Share on other sites

lovely image Steve especially the dark clouds and the structure within them 

  • Thanks 1

Share this post


Link to post
Share on other sites

It has depth and the color balance is spot on.  Nice stars.

Rodd

  • Thanks 1

Share this post


Link to post
Share on other sites

I like the delicacy of the first and the attitude of the last. Let's keep both versions!

Olly

  • Thanks 1

Share this post


Link to post
Share on other sites

I like these, but can't say which I prefer as I can't see them side by side!!! By the time I've scrolled down to view the next I've forgotten what the previous one looked like :D 

Share this post


Link to post
Share on other sites
30 minutes ago, swag72 said:

I can't see them side by side

I click on each of them in turn to view full size then just open in a new browser tab, toggling between the tabs to compare.

  • Like 1

Share this post


Link to post
Share on other sites
3 hours ago, ollypenrice said:

I like the delicacy of the first and the attitude of the last. Let's keep both versions!

Olly

Thanks again Olly, but the first version is definitely 'soft' as a result of a NR error (I think my mask was either absent or the wrong way round).  I suppose I could try using v3 as Lum over ........  (aaaaaaarghhhhhhh) ............  hang on a bit...

  

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By EyeGuy
      My effort from Derry last night - once I remembered to remove the cover from the field flattener. Doh.
      I know the North America Nebula is done to death, but this is my first time imaging it, and also my first time trying the Triad filter with my Nikon. I'm in the middle of the city but I was able to take 5 min subs! I processed in PixInsight, but didn't even have to do background extraction. I used photometric colour calibration to restore natural colour and then just did a bit of mild tinkering. I'm impressed by the Triad filter on my first try.
      Comments welcome - maybe I should try a star mask and try to bring out star colours?
      Barry
       
      22 X 5 min subs - 1hr 50min integration
      PixInsight for calibration / registration / processing
      Mount - Vixen AXD2
      Scope - TEC 180FL
      Camera - Nikon D750

    • By StaceStar
      Hi all
      I'm still transitioning from an unmodified Canon 200D to an Altair Astro 183C pro. I think this might be my best image yet, and the first time I have tried a mosaic.
       
      Its made of two panels, each panel has 20x120s + 30x60s. Stacked and stitched in Astro Pixel Processor and edited in PS CC 2018. I'm pretty pleased!
       
      Scope is a SW ED80 DS pro (reduced to 480mm, f/6) on a HEQ5 pro. Guided with a QHY5L-II in my finderscope.

    • By steppenwolf
      I've spent the day at the keyboard documenting some image processing techniques and as the skies have been so poor, I've had to use some old data for the screen shots but this one worked out OK with the new work-flow.
      A Wall of Ionization

      NGC 7000, the North America Nebula, is a very popular deep sky imaging object and its rich Ha emission content makes it particularly appealing for RGB imaging. However, I like to capture this region of the Milky Way in Cygnus using narrowband filters to really bring out the detail in ‘The Wall’.
      As well as the predominant Hydrogen Alpha (Ha), this object is also quite rich in doubly ionised Oxygen (OIII) emissions. The position of OIII emissions in the light spectrum, right on the cusp between green and blue, allows a full RGB colour image to be produced from just two sets of filter data by using the OIII data for both the green and blue channels and the Ha data for the red channel.
      Image Stats
      Mount: Mesu 200
      Telescope: William optics FLT98
      Reducer: William Optics FR IV
      Camera: QSI 683 WSG-8
      Filters: Baader 8nm Ha and 8.5mm OIII
      Subframes: 19 x 900 sec OIII, 19 x 600 sec Ha
      Control: CCD Commander
      Capture: MaxIM DL
      Post-Processing: MaxIM DL and PS3

    • By gnomus
      Following on from the 'free' widefield picture - https://stargazerslounge.com/topic/286774-free-rider-wo-star-71-and-horsehead/#comment-3142262 - here is the image through my Esprit 120.  This is 8 hours in total.  Last night we had a 'half-moon', more or less, and it was not too far away from the Horse.  The Ha subs in both the Esprit and the WO looked about the same as they had done when there was no moon about.  SGP does an Autostretch of downloaded subs.  The 'black point' of the moonless and half-moon shots were only about 100 ADU apart, which I thought was pretty good.  Rather foolishly I wasted time last night trying to get some LRGB.  A 5 min Lum sub, autostretched by SGP, had an ADU in the high 8,000s (and looked pretty horrible)!  Looks like I will have to wait for the disappearance of Moony McMoonface before taking on the LRGB acquisition.
      So this is:
      Skywatcher Esprit 120 Astrodon 3nm Ha - 24 x 20 minute subs = 8 hours QSI 690 I've tried not to go too 'extreme' with the processing:

       
    • By conspicuity
      Nice to have a few clear nights for a change!
      I finally managed to include some darks and flats . These are different versions of a set of 4 X 256s sub-frames. I think I prefer the less processed one (a) - the stars are less bloated.
      Any critique/advice welcomed!
       
       
      Borg 55FL f/3.6; Atik 490 EX colour


×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.