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NGC 7023 (Iris Nebula)


NGC 7023 (Iris Nebula)

A difficult subject, made harder by my 30s-per-frame limit. Barely a hint of any of the extensive peripheral dust clouds except for the fact that there are fewer stars in those regions.

Acquisition:

Bortle 7 skies
Nikon D7000 camera
Orion Apex 102mm telescope, 1300mm focal length
Orion AstroView EQ3 with single-axis drive
30s x 240 frames
f/12.7
ISO 800

Processing:

Siril:

Background color correction
Photometric color calibration
Asinh histogram transformation
Manual histogram adjustment

RawTherapee:

Chroma and luminance denoising
Color curves/black point/saturation to taste






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