Lynds Dark Nebula 673


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  • Exposure time: LRGB 120:30:40:40 minutes (10 minute sub-exposures for all channels)
  • 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 Astronomik LRGB filters
  • Camera: SBIG ST-8300M (T: -20 degrees Celsius)
  • Mount: Astro-Physics Mach1 GTO (guide rate: 1x, PEM activated)
  • Guidescope: TS OAG + SX Lodestar + PHD (settings other than default: RA Aggressiveness 70; RA Hysteresis 20; Min. motion (pixels) 0.35)
  • SQM: 21.5 magnitude per square arcsecond
  • Location: Etoile St. Cyrice, Hautes-Alpes, France
  • Date: August 7 - 8, 2010

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