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IC 4756 and NGC 6633 ("Tweedledee" and "Tweedledum")


IC 4756 and NGC 6633  ("Tweedledee" and "Tweedledum")

Acquisition:

Bortle 7 skies (with smoke haze)
Nikon D7000 camera
18-140mm zoom lens @ 140mm
iOptron CEM26 mount
30s x 120 frames
f/12.7
ISO 400

Processing:

SiriL:

Background extraction
Generalized hyperbolic transformation

RawTherapee:

Black point
Contrast
Luminance denoising

GIMP:

Luminance curve adjustment
Saturation increase
Temperature reduction






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