M22, or Messier 22, is a bright globular cluster in the constellation of Sagittarius that is readily visible in binoculars in the summer sky.
The dense star cluster is one of the nearest of the roughly 150 globular clusters surrounding the Milky Way. M22 was the first globular cluster ever discovered, back in 1665.
I took this photo with a TMB92L refractor telescope, an unmodified Canon T3i DSLR camera, and a Celestron CG-4 mount equipped with a tracking motor. This was one of my first-ever attempts at long-exposure, deep-sky imaging.
