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Messier 35 and NGC 2158

Messier 35 and NGC 2158


Bortle 7 skies
Nikon D5600 camera (unmodified)
ISO 200
Astro-Tech AT102ED refractor, 714mm focal length, f/7
HoTech 2" SCA field flattener (1X)
iOptron CEM26 mount
30s x 180 frames (1h 30m)


Siril 1.2.1:

Crop to 4800 x 3600px
BQ Octantis' procedure (starting here) of white balance, background subtraction, histogram conditioning, and black clipping
Generalized hyperbolic transformation stretch (3X)

RawTherapee 5.9:

L*a*b chrominance/luminance noise reduction (to reduce background chroma noise)
Defringe tool (to reduce blue in star fringes)
Luminance noise reduction

GIMP 2.10:

Luminance curve

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