Messier 13 is the brightest globular in Hercules.
Scope: Orion 8 inch f3.9 astrograph
Mount: Orion Atlas EQ-G
Camera: Nikon D3000, ISO 1600, raw format
Exposure: 5/02/2013 240 sec x 20 frames
Guiding: PHD guiding using an Orion short tube 80 and SSAG
Software: Deep Sky Stacker and Photoshop CS3 with Carboni Astro Tools.