NGC 6820 NGC 6820 Date: 13 – 19 August 2012 Exposure: 20.8 hours Ha-RGB (825:140:140:140 min.) FWHM: 2.0 arcsec. Additional notes: Ha-Image Telescope: 18” f/4.5 Newtonian Mount: Heavy Forkmount Camera: ALccd9 + ALccd Filterwheel Filters: Baader HaLRGB