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NGC 6939


NGC 6939

Acquisition:

Bortle 7 skies
Nikon D7000 camera
Orion Apex 102mm telescope, 1300mm focal length
iOptron CEM26 mount
30s x 114 frames
f/12.7
ISO 400

Processing:

Siril:

Background extraction
Generalized hyperbolic transformation
Manual histogram stretching
RawTherapee:

Luminance and chroma denoising
Black point
Contrast

GIMP:

Levels adjustment
Luminance curve adjustment
Temperature decrease (too orange)
Saturation






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