Interesting observation. The R8 doesn't have the mechanical shutter coming down when the camera is turned off. I've been taking TCs on and off repeatedly in the field with the R5 and R7, which have the protection, and have never needed to clean their sensors. The self-cleaning seems to take care of any problems.Speaking of which, my R8 needs a cleaning thanks to several lens changes while hiking on Mount Etna in Sicily, with lots of volcanic dust kicked up by fellow hikers.
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