Messier 17 aka the swan nebula in Sagittarius; magnitude: 6.0 ; size: 20'x15' ; large and bright, this nebula is beautiful in all apertures. Using a DGM narrow pass band filter, this object shows bright and dark patches. I used a 21mm Ethos at 115x with my 14.5 Starstructure Dob f/4.3m 17.jpg