A telephoto lens image of the globular cluster Messier 13 in Hercules. This is shot to simulate the field of view of binoculars for illustration purposes. The star at top is eta Herculis in the Keystone. The pair of red stars ar lower right at Nu1 and Nu2 Corona Borealis. This is a stack of 6 x 1-minute exposures with the 200mm lens at f/2.8 and Canon 6D MkII at ISO 800, tracked but unguided on the Mach 1 mount, on April 28, 2019.
Messier 14, a globular cluster in Ophiuchus. This is a stack of 8 x 4 minute exposures at ISO 1600 with the Canon 7D and 130mm Astro-Physics refractor at f/6 with the 6x7 field flattener. Taken at the SSSP 2012 in Cypress Hills.
M15 globular cluster in Pegasus. A 5 x 8-minute image stack with the Canon 7D at ISO 800 and 130mm Astro-Physics refractor at f/6, on AP 600E mount and SG4 autoguider.
