Hello Everyone,
today I show you an image of the closest planetary nebula to our Solar System: Sh2-216.
The apparent size of this nebula is amazing, the nebula itself is very faint to detect. With the red filter I had only a hint of it, while with the green and blu filters was undetectable. I had therefore to proceed in imaging also in the H-alpha and OIII emission lines to have it adequately highlighted.
http://skymonsters.net/personal/imma...mg=Sh2-216.jpg
I hope you like it, comments and criticism always welcomed.
Clear skies
Nicola