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Hello Astronomers,

Adding my latest image to the comp. This is the Swan (or Omega) nebula imaged during multiple nights between 28 July - 8 August 2019 with my Canon 40D DSLR through my 8" SCT at F10, 2032mm focal length. Imaged in narrowband through Baader SII, HAlpha and OIII filters and combined as SHO (Hubble Palette) colour.

Total exposure time was 27 hours.

HAlpha Subs are 10 & 15 minutes long, OIII subs are 15 & 20 minutes and SII subs are all 30 minutes so I had to spend at least 2 whole nights per filter, except in the case of SII which was 3 nights. The amount of time it took to gather the subs wasn't crucial since I have a permanent setup and resuming exposures night to night took about 10 minutes, and I wanted as many subs as possible to keep the noise level to a minimum, and to be honest I could just keep on adding subs for as many nights as M17 was in the sky on moonless nights but I find that more than 40 subs per channel on brighter objects seems to have diminishing returns.

Gathering more and more subs is made it easy when we're in a drought and there are hardly any clouds in the sky, mostly dry and cloud-free nights lately, which allowed me to have 100% successfully exposed subs.

All subs are ISO1600 and the active cooling definitely helps with the noise levels, most noticeable with SII when comparing to my SII 1800 second subs captured in the past.

Clear skies,



Edited by MarsG76
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  • Similar Content

    • By MarsG76
      Hello all,
      Sharing with you my finished image of the Swan nebula imaged through SII, HII and OIII narrowband filter using my modded and cooled Canon 40D. Imagd trough my C8" SCT at 2032mm focal length.
      Total exposure was 27 hours across multiple nights.
      Clear Skies,

    • By MarsG76
      Hello Astronomers,
      This is a work in progress, I'm spending my clear moonless nights capturing narrowband data of M17, at 2032mm focal length through my 8" SCT, using my Cooled and modded 40D.
      I still have SII to capture to complete the project but for now I played with the data I already have.
      As it turns out that both the HAlpha and OIII subs have a considerable amount of blue data in them, separated due to the DSLR being a OSC camera, so I used the red out of the HAlpha image, green from OIII green channel and added the blue from HAlpha (the Hbeta data) and blue from the OIII stack and used it as the blue channel, resulting in a almost natural color pseudo RGB image, attached.
      Once I have the SII data, I'll assemble the channels into a SHO narrowband image of M17.
      Clear skies,

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