by Aratus » Tue May 09, 2017 11:59 am
The moon is not a friend to the deep sky observer, unless it stays away!
You could get a little more detail by making it even brighter, but you have to watch you don't over do the bright core stars. M13 is very distictive with the 'cross' of stars in the centre and the 'arms' of bright stars radiating out.
I use an 11" reflector (Celestron CPC 1100) and a 3" refractor, (Sky-Watcher ST80) mounted on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI 120MM, ZWO ASI1600MC and Canon 1300D for imaging.