M3 by Don McCrady
Via Flickr:
M3 is a fine globular cluster in the constellation Canes Venatici. It is approximately 40 thousand light years distant from us, and like all globular clusters contains many elderly red stars. This is 40 minutes each of red, green, and blue through a Stellarvue SVS130 and SBIG STL-4020M. Processed in MaximDL, PixInsight, and Photoshop. The final image was upsampled 2x.