Messier 57 (Ring Nebula)

Better images here and here
Acquisition:

Bortle 6-7 skies
Nikon D7000 camera
Orion Apex 102mm telescope, 1300mm focal length
Orion AstroView EQ3 with single-axis drive
30s x 34 frames
f/12.7
ISO 1600

Processing:

Siril:

Photometric color calibration
Background extraction
Histogram asinh stretch
Manual histogram adjustments

GIMP:

Small amount of chrominance and luminance noise reduction (G'MIC-Qt plugin)
Minor exposure adjustment
Minor saturation increase