I did 3 hours and 15 minutes of LRGB on M13 the past two nights with my Edge 8 and SX H16 with no moon. These were all 60 second, unguided exposures. Here's a link Albert https://www.flickr.com/photos/49526053@N04/14212543876/in/photostream/lightbox/ -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.