Hi-ho,
I'd be giving the blower a shot..
I think Jimmy's being a little over cautious by not doing anything.. If you've got a blower-bulb, give it a go on the mirror and screen.
I do agree that a great deal of caution needs to be used if you're going to be using the brush though.
If it's on the bottom ('outside') of the focusing screen, and can be blown off, you'll be able to see it without a lens on, so you can verify pretty quickly if the blower bulb has done the trick.
Jimmy is correct that if the mark is in very clear focus, it's more than likely on the back (Top) side of the screen, and might be something you have to live with, or get a camera repair firm to look at.
Canon SLR's focus on the inside / top surface of the screen.. (most do as far as I know).
And if you're not sure where the focusing screen is, it's above the mirror in the camera body, on the 'roof' of the camera 'box'. Just point your blower bulb up there and blow a few times, don't touch the mirror or screen with the tip..
Hmmm, just looking at my 20D... In the good old days with my OM4 I could just un-clip the screen to clean it, looks like a major operation on the 20D... And from the photos on dpreview of the lens mount the 300D looks the same. 'No user serviceable parts inside'.
Good luck, and if you're not confident, take the fish's advice. :-).
Cheers, Chris H.
Message edited by author 2004-12-04 03:49:09.
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