Hard object to image from my location. 12° above the horizon is the highest point in the sky it can get. Anyway, took my chances and shot bunch of frames. Only small amount of frames have met the selection criteria for stacking, but being that globular cluster, it seems that you can get away with just of few of them, in my case only 14 survived.
http://www.myastroscience.com/#!ngc5139-/cb23Thank you for looking!
