NGC 6820 & NGC 6823




Crop at 75% of full resolution.

  • Exposure time: 240 minutes (12x 1200s)
  • Processing: Nebulosity 2.3 (pre-processing, stacking & DDP); Adobe Photoshop CS4 (post-processing)
  • Lens/telescope: INTES 150 mm (6") MK-69 at f/6 with Baader H-alpha 7 nm narrowband filter
  • Camera: SBIG ST-8300M (T: -20 degrees Celsius)
  • Mount: Astro-Physics Mach1 GTO (guide rate: 1x, PEM activated)
  • Guiding: TS OAG + SX Lodestar + PHD (settings other than default: RA Aggressiveness 70; RA Hysteresis 20; Min. motion (pixels) 0.35)
  • Location: Zoetermeer, The Netherlands
  • Date: July 17 - 18, 2010


A timelapse movie I made during that night with an Olympus E-500 DSLR and Zuiko 14-45 mm 1:3.5-5.6 at 14 mm f/5. Exposed every 2 minutes.

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