Image spcefications:
- Exposure: LRGB = 60:15:15:15 minutes, Ha 5 hours
- Camera: SBIG ST-8300M, Temp -25 ° C, Baader LRGB filters, Astrodon 5nm Ha filter
- Instrument: Meade 25 cm ACF, focal distance 2500 mm
- Mount: Losmandy G11
- Guiding: TS Off Axisguider, Starlight Xpress Lodestar autoguider and PHD
- Location: Etoile St. Cyrice, France
- Sky Quality Meter: 21,47
- Temperature: Ambient: 5° C
- Date: 6 may 2011
Image acquisition with ImagesPlus 4.0 Camera Control (all at -25° C) with dither:
- 4 Luminance of 15 min, binned 2x2
- 3 Red + 3 Green + 3 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 15 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)
- Reduce High Low Pixel
- Star Size Reduction / Smoothing, 6 ierations
- Digital Development (DDP)
- Deconvolution Adaptive Richardson Lucy, 5 iterations
Processing in Registar:
- Align Luminance, Red, Green and Blue results
- Combine 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 30%)
- Match Color
- Curves
- Levels
- Plugin: Noise Ninja
- Noel Carboni's astronomy tools: Star size reduction
- Unsharp Mask
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