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images world war 1 propaganda posters world war 1 propaganda postersMatsPNovember 14th, 2007, 03:41 AMI don't know the Nikon story on sensor cleaning, but most cameras have a "mode" for sensor cleaning, which essentially leaves the mirror up until you switch it out of that mode. As to formatting your memory card, my principle is "whenever there is a problem with them". I don't format my cards "