Well folks, I was wrong!! Read on....

Started May 26, 2012 | Discussions thread
OP BillyGoatGruff Forum Member • Posts: 93
Dust is UNDER the focusing screen

SemIam wrote:

Have you tried cleaning your glasses?

No dust in mine but just a matter of time, I change lenses frequently.

Any jackass can blow dust off the mirror and the exposed side of the focusing screen. What I have found on my 5D Mark III's is dust under the focusing screen. That can't be blown/cleaned off. That's an issue of Canon not keeping the clean parts of their cameras clean during production.

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