M57 - The Ring Nebula

Narrowband image - CFHT Palette (Ha-OIII-SII), 12" LX200R scope at 3200 mm focal length

(35 hours total exposure - Ha for Red 16x30 min B1 plus 6x30 min B2, OIII for Green 12x30 min B1 plus 8x30 min B2, SII for Blue 5x30 min B1 plus 19x30min B2; June 2012)