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Message: <blockquote data-quote="Marcel" data-source="post: 217782" data-attributes="member: 3903"><p>I doubt you would be able to see dust on the mirror in the viewfinder. Most of the time, the dust you see in the viewfinder is stuck under the focusing screen. If your gentle enough, it usually can be brushed out or blown out. You can use a vacuum cleaner small nozzle close to the lens mount to get the dust outside the camera's chamber. It is important to get it out the cavity because otherwise it could end up stuck to the sensor when the mirror goes up and the shutter opens.</p></blockquote><p></p>