2/3rds the way through our trip & the mystery bird/bat starts to show up in exactly the same spot in the frame...amazing eh? Lucky we were in Dunedin & the only camera store in town ("Jonathons" I think) said bring it in & we'll do it straight up. $30 & all is good. Lesson here is I've always turned the body off BEFORE changing lenses. Just prior to this I frantically changed lenses when the dolphins turned up & paid the price as the sensor is still charged & just sucks that dust in!! Bunnies are not cute.