NGC 2158

This is from adding a little more integration and reprocessing the same data used for this image.

Acquisition:

Bortle 7 skies
Nikon D5600 camera
Orion Apex 102mm telescope, 1300mm focal length
iOptron CEM26 mount
30s x 253 frames (2h 6.5m)
f/12.7
ISO 400

Processing:

Siril 1.2.0-beta2:

Photometric color calibration
Background extraction
Generalized hyperbolic transformation

RawTherapee:

L*a*b chrominance related to luminance curve
Luminance noise reduction
Saturation increase

GIMP:

Levels
Luminance curve
Saturation
Rescale down t0 1600x1200px (to fit here)