Messier 81 (Bode's Galaxy)

See also newer image with more data and reprocessed

Acquisition:

Bortle 7 skies
Nikon D7000 camera
Orion Apex 102mm telescope, 1300mm focal length
Orion AstroView EQ3 with single-axis drive
30s x 367 frames
f/12.7
ISO 800

Processing:

Siril:

Background extraction
Manual color calibration
Asinh transformation
Manual histogram adjustment

RawTherapee:

Chroma and luminance denoising

GIMP:

Luminance curve adjustment
Slight temperature increase (to make the core less blue)
Slight saturation increase
Slight contrast increase