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Messier 27 (Dumbbell Nebula)

Messier 27 (Dumbbell Nebula)


Bortle 7 skies
Nikon D5600 camera
ISO 200
Astro-Tech AT102ED refractor, 714mm focal length, f/7
HoTech 2" SCA field flattener (1X)
iOptron CEM26 mount
30s x 414 frames (3h 27m)


Siril 1.2.1:

Crop to 3600 x 2700px
BQ Octantis' technique of white balance, background subtraction, and histogram conditioning
Star desaturation
Background - modified asinh stretch (4X), generalized hyperbolic stretch, background extraction, black point, histogram adjustment
Stars - modified asinh stretch (3X), synthetic blue, saturation

RawTherapee 5.9:

L*a*b* CL curve (to reduce background chroma noise)
Luminance noise reduction

GIMP 2.10:

Luminance curve

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