Here are my attempts at Startrails. Can only do an hour as my battery can't hold out any longer. The 1st few were just short half hour attempts, 10 sec expsoure's each, to the last one where I managed to get an hour's worth of 10 sec expsoure's. I took as many photo's as I could and run them through a free program called Startrails. Very easy to use, just load all your images in and it does the rest for you!! I'll add a link under fav sites for anyone interested.