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M57
(click on the image for the highest resolution)
            


 
Object:             Messier 57, the ring (planetary) nebula in Lyra
Telescope:      
Astrograph 400 f/4 Newton  (APM 1.5x multiplier/corrector up to 2440mm fl). Paramount ME.
Camera:           Artemis ART4021.   Baader H-alpha & Oiii filters. Astronomik RGB filters.
Exposures:       Ha :  96 x 15'    (24:00 ) 
                         Oiii:  27 x 15'    (  6:45 )
                         R:    12 x 10'    (  2:00 ) 
                         G:    12 x 10'    (  2:00 ) 
                         R:    14 x 10'    (  2:20 ) 
Resolution:       0.39"/pixel  (drizzle resampled)
Guiding:            Moravian G0 on Off-Axis Guider
Date:                 September - October  2018
Site:                  Sagan Observatory  Las Rozas  (Spain)     - mag 4.5 suburban skies -
Processing (simplified):
Bias, Darks & Flat calibration
Drizzle integration
Deconvolution
Histogram & Curves adjustments
HDRMT
LRGB combining (nebula:Halpha-Oiii; stars:RGB)


Software:
PixInSight