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this was a compilation of 5 separate ~5 minute exposures for a grand total exposure of just over 26 minutes. a difficulty experienced was that the -20C temperature not only froze MY buns off, but it killed my camera battery so that it took over 20 seconds to process each image before i could take the next one. this resulted in gaps between all the stars when i put it together, so it took ALOT of CLONING time in PS, you may still see a few gaps in the fainter stars. unfortunately there was a fair bit of cirrus type clouds, so the stars are only clear in one portion of the image. f/5.6 ISO 200 10mm :)