M22 is the 3rd largest globular cluster as seen on earth. I am quite happy with the resolving power of my 4" refractor, which can show the other layer of the individual stars in this cluster.
Date: Jul 5, 2014
Time: 01:38 (HKT)
Location: Hong Kong
Camera: Nikon D90 (unmodified)
Telescope: Vixen 102M 4” F/10 Refractor
Full frame equivalent focal length: 1500mm
Filter: Hutech LPS-P2
ISO: 1600
Exposure: 90sec x 5 = 7min 30sec
Tracked by Astro LN Mount with Vixen motor, Unguided
Stacked and Processed by DSS & PS