“M13 is generally considered the finest globular cluster in the northern skies, mainly because it is visible to the naked eye in a well-known grouping of stars that sails high overhead in the summer sky. It is a swollen mass teaming with perhaps 300,000 to a half-million suns spread across 140 light years or more.”
Stephen James O’Meara
“Deep-Sky Companions – The Messier Objects”
M13 was taken in monochrome with a Luminosity Filter. The best two of five 120 second photos were stacked. The Telescope was the Celestron C11 EdgeHD at F7 and the camera was a QSI 583wsg. Processed in Photoshop CS6 and Maxim DL.