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Message: <blockquote data-quote="480sparky" data-source="post: 500611" data-attributes="member: 15805">Everything you see on an image is rotated 180° relative to what the sensor sees.  So if it's in the top left of the image, the dust will be in the bottom right of the sensor.Now, when you turn the camera around to look into the mirror chamber, that will rotate the sensor and the dust spot will be in the bottom left as you look in.As for cleaning, just clean the whole sensor and not worry about the physical location of a particular chuck of real estate on the sensor.  Plow everything off the sensor and call it a day.</blockquote>