Quote Originally Posted by jrw View Post
When 1Dx went in for lube check it was supposedly cleaned as well. Sensor came back absolutely filthy.

...Still know how to remove focus screens and clean it outside of the camera if it looks bad.
That's too bad. When I brought mine in to the service center, after they were done I walked outside and shot the blue sky with the 40/2.8 stopped down, and the sensor was totally clean (although I've had to clean it a couple of times since then).

For the focus screen, I was thinking of it from Brant's perspective, the 5DIII focus screen doesn't just pop out.