
Originally Posted by
EdN
I think both you and your friend are neurotic.
Regarding her *spotty* mirror, the actual dust particles may be stuck inside the pentaprism housing under the flash. Cleaning the mirror won't help and unless there is a LOT of dust inside the pentaprism housing, she may be getting needless and expensive work done for nothing. It's a big job to open up and clean the pentaprism housing. It's nice to have it clean but if you can't keep it clean and it doesn't affect your photography, what's the point?
Regarding getting nervous changing lenses frequently, that's compulsive behavior. That's what the camera is built for. When you change lenses, just make sure you do it in a relatively clean area, and make sure you do it quickly to minimize dust ingestion. If you do get dust on the sensor, you will see it on your images and you can blow it out with the rocket blower. If it gets really bad, you can get special swipes to clean the sensor without having to send it into Canon.
I've unfortunately got dust inside the pentaprism housing of my 5D. Am I annoyed, Yes! What do I do? I use a rocket blower to make sure the mirror and sensor surfaces are clean and carry on. (I have swipes to clean the sensor but don't really think it is necessary.)
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