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Message: <blockquote data-quote="BackdoorArts" data-source="post: 220738" data-attributes="member: 9240"><p>I'm thinking Marcel is onto something with the sensor noise.  None of this makes any kind of sense in my early morning fog, but given that this does not happen with your Sigma (assuming all other things are equal - including the 30 sec exposure time), I noticed that you shot with the zoom wide open at 18mm.  For giggles I'd try it again at 50mm and at 200mm and see if it does the same thing (I would expect it to), and then turn on Long Exposure NR and see if it goes away.  I don't believe I'm offering answers, but it may help focus the symptoms.</p></blockquote><p></p>