Cygnus is a very rich constellation for PNs.
Four of them are particulary interesting, depending on their brightness and structure.
Here are how I saw them, in a 10 inches SCT, and a 25 inches dobson.
NGC 6826: http://www.deepsky-d...2017/dsdlang/fr
NGC 7008: http://www.deepsky-d...7008/dsdlang/fr
NGC 7026: http://www.deepsky-d...7026/dsdlang/fr
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