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Message: <blockquote data-quote="Peter7100" data-source="post: 830420" data-attributes="member: 48633"><p>It really depends on a few factors, like iso, and aperture and how dark it is. I the one in question was taken at F2.8, iso 1600 and 15 seconds. The important thing to note if taking star shots is to use the 500 rule, otherwise you will get star trails and not just aircraft light trails. There is lots online about this, but basically if you were using say a 50mm focal length then you divide 50 into 500 and the number 10 is the longest number of seconds you should expose for unless you have a sky tracker attached. I was using 16mm focal length, so in theory I could have exposed for 31 seconds.</p></blockquote><p></p>