Hiked up to local lake with my gear. Set focus to infinity and adjusted slightly on the brightest star. Took a couple very high iso shots so i could get what i wanted in frame. all looked good. wrapped a boot warmer around lens to keep from frosting. fired off another test shot. all looked ok. proceeded to take 300 thirty second images...all of them out of focus. my first time lapse attempt. i will do it again if we ever get the weather. silliness. still not sure where i blew the focus.