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Luke I assume you just had your camera on a tripod. With that focal length lens 1 sec is probably the maximum you can go without your stars looking like eggs. There is somewhere on the net I remember reading which gave maximum times for each particular focal length lens before stars were no longer round. Obviously the shorter/wide angled lenses gave greater exposure times than the longer focal length ones. You've probably done the best you could have achieved with your lens at 300mm fl on a tripod.
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