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So, after standing in a field for 2 hours trying to get some star trails, freezing my butt off i get home to find i'd shot them all on iso 25000!!!! instead of 100. To be fair the star trail wouldn't have been that good anyway as the tree moved to much and looked a little rubbish.
But i managed to salvage this shot, the uber high iso brought out all the smallest stars though, every cloud and all that!