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M20 & M21

Outer region including OIII area surrounding the Triffid.

Telescope:  Astro Physics 12" Riccardi-Honders f3.8.
Mount: Software Bisque Paramount ME II
Camera: SBIG STXL 16200
Filters: Astrodon
Exposures:  OIII 5.5 hours, Ha 3.5 hours plus 20 minutes each RGB for stars.

Inner region (The Triffid)

Telescope:  RC Optical Systems 12.5" f9
Mount: Software Bisque Paramount ME
Camera: SBIG STL 11000M
Filters: Astrodon
Exposures:  Ha 3 hours, SII 3 hours, OIII 3 hours.

NASA APOD 28 Jun 2017