The Ring Nebula (M57) is a planetary nebula in the northern constellation of Lyra.Such objects are formed when a shell of ionized gas is expelled into the surrounding interstellar medium by a red giant star, which was passing through the last stage in its evolution before becoming a white dwarf. It is at about 2300 l.y. from Earth. (dixit Wikipedia)
This photo was taken from my garden with a scope (Newtonian 200/1000), my old mount (EQ6) and a CCD camera (Atik One 6.0), in black and white with R,G,B and L filters, for a total of 3.5 hours exposure in August 2015.
Technical detail of the photo here: https://www.astrobin.com/200419/
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