Jump to content

sgl_imaging_challenge_2021_4.gif.6a323659519d12fc7cafc409440c9dbf.gif

Recommended Posts

Hello all,

 

This is my latest image of the Eagle nebula (M16/NGC6611) in the constellation Serpens, this time imaged through narrowband filters using my 8" Celectron SCT, at F10 - 2032mm focal length, with my astromodded and active cooled Canon 40D DSLR.

The second image is a cropped and rotated version to emphasize the famous "Pillars of Creation" part of the nebula, made popular by the HST image of the same name.

The color channels are SII, HAlpha and OIII as RGB, and color balanced to remove the heavy green color cast created by the strong Hydrogen Alpha signal.

 

The total exposure time spent on this image was 20 hours and 57 minutes consisting of the following subs exposures:

RGB: 13x15s, 19x30s, 17x60s, 12x90s, 17x120s, 15x180s

HII: 2x600s, 9x900s, 4x1200s

OIII: 1x600s, 8x900s, 1x1200s, 11x1500s

SII: 2x500s, 14x1800s

All at ISO1600.

 

Clear Skies,

MG

 

 

 

 

M16 SHO F10 20Jul-14Aug2020 Frm.jpg

M16 Pillars SHO F10 20Jul-14Aug2020 Frm.jpg

Edited by MarsG76
  • Like 17
Link to post
Share on other sites

Pretty good. There's some star halo that detracts a little, not sure if it's down to processing or filters. 

Also worth inverting the image and doing SCNR on green to reduce the purple tinge.

Overall though, the pillars have come out well.

  • Thanks 1
Link to post
Share on other sites
14 hours ago, MarkAR said:

Pretty good. There's some star halo that detracts a little, not sure if it's down to processing or filters. 

Also worth inverting the image and doing SCNR on green to reduce the purple tinge.

Overall though, the pillars have come out well.

Those star halo's are much better than they were during the initial combining of the SHO channels.... but now that you mention it, when I get a bit of time, I might do Starnet++ on each channel and perhaps add the RGB stars... might make the stars tighter and improve the overall image?

 

  • Like 1
Link to post
Share on other sites
3 hours ago, MarsG76 said:

might make the stars tighter and improve the overall image?

Worth a try, halo's can be really difficult. Another option is to try and soften the halo's so they aren't so defined.

Edited by MarkAR
  • Like 1
Link to post
Share on other sites
On 31/08/2020 at 20:19, MarkAR said:

Worth a try, halo's can be really difficult. Another option is to try and soften the halo's so they aren't so defined.

I might try (when I get some time to play) and remove the stars again, this time from this final version image that I posted and deal with the halos in that way... perhaps adding the RGB stars from my short exposed subs to keep them tight....

Link to post
Share on other sites
On 31/08/2020 at 19:31, tooth_dr said:

A master with the 40d Mariusz :icon_salut: excellent work. 

When I cooled my 40D and reached around freezing on the sensor on nights when it 20C, the quality of my subs increased substantially... to the point where I'm wondering about exactly how much improvement would I have with a cam like the ZWO 1600MM/2600MC on my gear in the real world situation... is it really worth the few thousand $ expense?

I mean my 1800 second NB subs are almost noise free now... I dither all subs and so really the only improvement in the real world would be time taken to capture the same about of photons per sub.. ie a sensor with 35-40% vs 80% QE .. but exposure time is of no bother as I have a lot of clear nights and a permanent setup that works nearly flawlessly resulting in round stars at 2032mm focal length. I can set it up after/before work nights, start the subs exposures, forget about it while it does its thing all night while I sleep... The only thing I'm short on is processing and actual eyepiece observation time.

 

 

  • Like 2
Link to post
Share on other sites

I played with the data a bit more and I'm going to leave it at this point.. no matter what I do from here, the image starts to look over cooked and over processed, but that said, the stars looks slightly tighter and there is a bit more detail within the pillars, subtle as it is...

M16 Pillars SHO F10 20Jul-14Aug2020 Frm.jpg

M16 SHO F10 20Jul-14Aug2020 Frm.jpg

Edited by MarsG76
Link to post
Share on other sites
On 05/09/2020 at 20:24, Datalord said:

It looks to me like you have some problems with focus. How did you focus for the various filters?

I don't think that I have any problems with focus, but more of a atmospheric seeing issue... I use a bathinov mask to focus with every filter.

 

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Astrodinsk
      Telescope / shooting lens: Sky-Watcher Newton 150/750 Cameras for shooting: ZWO ASI294MC Pro color Mounts: Sky-Watcher HEQ5PRO SynScan GoTo Telescope / Lens Guides: SVBONY 60/240 Guide cameras: ZWO ASI462MC Programs: Pleaides Astrophoto PixInshight Filters: Optolong 2 "L-eXtreme Dual Band 7nm HA / OIII Filter Accessory: Baader MPCC Mark III Coma corrector MPCC Mark III Dates: May 12, 2021 Frames: Optolong 2 "L-eXtreme Dual Band 7nm HA / OIII Filter: 12x300" (1h) (gain: 120.00) -5C bin 1x1 Accumulation: 1h Dark frames: ~ 12 Flat field frames: ~ 12 Dark frames for flat field frames: ~ 12 Offset Frames: ~ 12 Wednesday Moon age: 0.63 days Average moon phase: 0.45% Bortle scale for assessing the darkness of the sky: 5.00 Temperature: 15.00
    • By MarsG76
      This image is a cropped and rotated version of the M16 image to emphasize the famous "Pillars of Creation" part of the nebula, made popular by the HST image of the same name.
      The color channels are SII, HAlpha and OIII as RGB, and color balanced to remove the heavy green color cast created by the strong Hydrogen Alpha signal.
      The total exposure time spent on this image was 20 hours and 57 minutes consisting of the following subs exposures:
      RGB: 13x15s, 19x30s, 17x60s, 12x90s, 17x120s, 15x180s
      HII: 2x600s, 9x900s, 4x1200s
      OIII: 1x600s, 8x900s, 1x1200s, 11x1500s
      SII: 2x500s, 14x1800s
      All at ISO1600.
    • By MarsG76
      My latest image of the Eagle nebula (M16/NGC6611) in the constellation Serpens, this time imaged through narrowband filters using my 8" Celectron SCT, at F10 - 2032mm focal length, with my astromodded and active peltier cooled Canon 40D DSLR.
      The color channels are SII, HAlpha and OIII as RGB, and color balanced to remove the heavy green color cast created by the strong Hydrogen Alpha signal.
      The total exposure time spent on this image was 20 hours and 57 minutes consisting of the following subs exposures:
      RGB: 13x15s, 19x30s, 17x60s, 12x90s, 17x120s, 15x180s
      HII: 2x600s, 9x900s, 4x1200s
      OIII: 1x600s, 8x900s, 1x1200s, 11x1500s
      SII: 2x500s, 14x1800s
      All at ISO1600.
       
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.