The globular cluster Messier 3 in the constellation Canes Venatici on April 8/9, 2011. Discovered by Charles Messier in 1764, this cluster contains an estimated half million stars and is 33'900 light years from Earth. It can be seen in a small telescope.

Three 8 minute exposures, two 4 minute exposures and two 2 minute exposures at ISO 1600 were added for this shot.
Equipment: Canon EOS 20Da camera, TeleVue coma corrector, Zambuto 16" f/5 quartz optics in a Dieter Martini dobsonian telescope, dual-axis Tom Osypowski equatorial platform, Lacerta MGEN autoguider, Teleskop-Service off axis system TS-OAG9 EOS.