Image spcefications:
- Exposure: 11 hours, LRGB = 230:50:50:50 minutes, 5 hours H-alpha
- Camera: SBIG ST-8300M, Temp -20 ° C, Baader LRGB filters, Astrodon 5 nm H-alpha filter
- Instrument: Meade 25 cm with AstroPhysiscs reducer, focal distance 1750 mm
- Mount: Losmandy G11
- Guiding: TS Off Axisguider, Starlight Xpress Lodestar autoguider and PHD
- Location: Etoile St. Cyrice, France
- Sky Quality Meter: 21,27
- Ambient temperature: 15° C
- Date: 30 august 2011
Image acquisition with ImagesPlus 4.0 Camera Control with dither:
- 23 Luminance of 10 min, binned 2x2
- 9 Red + 9 Green + 9 Blue of 5 min, binned 2x2
- 15 H-alpha of 20 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)
- Align and combine Red, Green and Blue results (1:1:1,2)
- Digital Development (DDP)
- Reduce High Low Pixel
- Deconvolution Adaptive Richardson-Lucy (PSF 5x5, 10 iterations)
Processing in Registar:
- Align Luminance and RGB
- Align LRGB and H-alpha
Processing in Photoshop CS3:
- Combine Luminance and RGB with Lab Color (Split RGB and Combine Lum, a, b)
- Combine H-alpha with LRGB with split channels and paste H-alpha to red channel (Blend Mode Lighten, opacity 40%)
- Curves
- Levels
- Saturation
- Color Balance
- Selective Color
- Noel Carboni's astronomy tools: Star size reduction
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