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p.1 #2 · p.1 #2 · Focus screen damage and AF LED misalignment | |
You can't physically mount an EF-S lens on a FF body, unless the lens has been modified. The common way a focus screen is damaged is by someone just touching it, perhaps trying to clean it. When you get the new one, be sure to only handle it by the edges, and only clean it with a hand blower.
The mirror might just be smudged, and the mirror really isn't as fragile as folklore tells. I've cleaned mirrors on several Canon bodies, using very gentle pressure and a damp microfiber cloth. I believe there is a thin layer of protection over the silvering, but could be wrong. I haven't ever scratched one, though.
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