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Message: <blockquote data-quote="BeegRhob" data-source="post: 744340" data-attributes="member: 48712">After 1 or 2 seconds, but not before is when it "shakes". The camera would be consistently doing it, unless there are other factors after 1 or 2 seconds, like wind blowing the tripod or someone leaning on the tripod, something like that. The wind blowing may happen before the 1 to 2 second sweet spot as well. You used an envelope to control the light entering the sensor, so when the shutter closes, there should be no light available to the sensor. So, we have a comet, moving at a high rate of speed, but 160 million  miles away. We also have the rotation of the earth to take into  consideration. I am looking at this being the culprit, not anything else. I could be wrong.Rob</blockquote>