1. Did you use IS / VR on a tripod? That would do it.
2. Could be mirror slap. What body do you have? Look into mirror lock-up.
3. Get a sturdier tripod, or try hang some weight from the center mast.
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1999 e46 328i Ti Silver / Black[retired]
2007 e90 335xi Jet Black / Black[retired]
2011 e70 X5 35d Vermillion Red / Cinnamon
2011 e92 M3 LeMans / Fox Red extended
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