Star Clusters M22 Globular Cluster with AT60ED Image September 13, 2021 admin Leave a comment M22 Globular Cluster.12 x 180 sec, QHY183c at -15C, Gain 11, Offset 50, Optolong L-eNhance filter, Astro-Tech AT60ED at F/4.8, SharpCap 3.2 Live Stacking for acquisition, metro-area light pollution