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How to clean the focusing lens? - Cannon EOS 50D Digital Camera

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First question: where is the dust?
If the dust ist outside the cam: no problem. Try a soft brush and remove bigger particles, then take a thin microfibre cloth and clean the dust film on the lens. Be careful - every sand particle scratches the coating, so use the brush!
If the dust is internal it's more complicated.
May be the dust is on the focussing screen. If you dismout the lens, there is a litte lock on the top inside the cam. Do not open without having special tool. Each fingerprint on this little plastic plane is not removable. It's an extreme sensitive fresnell lens.
Don't try to clean that with cloth or brush. Only airflow is allowed.
If this dosn't help - use the Canon service or replace the focussing screen with a new one (as Example Canon EF-D).

Posted on Sep 12, 2014

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Posted on Jan 02, 2017

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