NGC7023 Iris Nebula

Constellation: Cepheus        Distance: 1400 lightyears

Iris Nebula

Click for full resolution (3272 x 2412)

Image spcefications:
  • Exposure: 6 hours, LRGB = 230:45:45:45 minutes
  • Camera: SBIG ST-8300M, Temp -20 ° C, Baader LRGB filters
  • Instrument: TEC 140 with field flattener, focal distance 980 mm
  • Mount: Losmandy G11
  • Guiding: TS Off Axisguider, Starlight Xpress Lodestar autoguider and PHD
  • Location: Etoile St. Cyrice, France
  • Sky Quality Meter: 21,34
  • Ambient temperature: 10° C
  • Date: 29 august 2011

Image acquisition with ImagesPlus 4.0 Camera Control with dither:
  • 23 Luminance of 10 min, binned 1x1
  • 9 Red + 9 Green + 9 Blue of 5 min, binned 2x2
  • 20 Flat fields per channel with Aurora Flatfield panel
  • At home, camera in fridge:
  • 20 Dark frames of 10 min + 20 Dark frames of 5 min
  • 20 Flat darks (per channel) + 20 Bias frames

Processing in ImagesPlus 3.82:
  • Automatic Image Set Processing per channel: calibrate, normalize, grade
  • Align and combine (Min Max Excluded Average)
  • Digital Development (DDP)
  • Reduce High Low Pixel

Processing in Registar:
  • Align and combine Red, Green and Blue results
  • Align Luminance and RGB

Processing in Photoshop CS3:
  • Combine Luminance and RGB with Lab Color (Split RGB and Combine Lum, a, b)
  • Curves
  • Levels
  • Saturation
  • Color Balance
  • Selective Color
  • Plugin: Hasta La Vista, Noise Ninja