M31 Andromedagalaxie

Schwäbisch Hall, 07.12.2015

Instrument: Canon EF 2,8/70-200 @200mm
Mount: Skywatcher EQ-5 Synscan
Camera: Moravian G2-8300 + EFW2-7 Filterwheel
Filter: Baader LRGB, Baader H-alpha 3.5nm
Software: APT 2.91, PHD 2.5.0, DeepSkyStacker 3.3.2, Fitswork 4.4.7, Gimp 2.9

Exposure:
Luminance 18 min. (16 x 2 min. bin 2x2)
Red 10 min. (18 x 30 sec. bin 2x2)
Green 9,5 min. (17 x 30 sec. bin 2x2)
Blue 9,5 min. (17 x 30 sec. bin 2x2)
H-alpha 96 min. (16 x 6 min. bin 2x2)

Composition: H-alpha plus Red as Red Channel
- Stacking with DeepSkyStacker
- LRGB image with Fitswork
- 10x H-alpha plus Red as Red
- RGB-Composition with histogram skaling
- L-RGB (with shifting)
- image optimization with Gimp
- histogram stretching
- luminance curve adaption
- color adaption
- color saturation increased with greyscale mask to avoid background noise
- star size reduction with erosion filter

M31AndromedagalaxieSchwäbisch Hall2015Canon EOS 5D Mark IIIEQ5