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Mark, it is indeed a track car. I took that at the Sonoma historic races last spring. Nothing like seeing a track full of Cobras, Tigers and Shelby mustangs tearing it up for real.
Sensor dust can really sneak up on you if you routinely shoot wide open, and then stop down to like F8 or 11. Stuff you never see at larger F stops shows up all over the place all of a sudden. If you use Canon DPP software, it can actually dust map and take out the spots for you.
I don't trust myself to mess around with the sensor, so I just joined Canon CPS and send my bodies off once a year for a free clean and check at Canon in Irvine CA.
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