Trash in the viewfinder

When I look through the viewfinder, I see a few small pieces of trash. The mirrors are clean, and cameras was aired. Need help for how clean, or do I need to drop it somewhere.
Thank you from Texas

It's dust, probably based on the 'top' of the focusing screen.  The screen is a frosted surface (usually the upper part is frosted and the bottom is brilliant).  The camera is projecting an image focused on this screen, because the distance between the lens and the image inside the camera sensor is exactly the same distance as the distance between the lens and the mirror to the frosted glass.

When you look through the viewfinder, you're actually seeing a projected image on the screen to update (a bit like a rear projection TV screen).  This sort of would be like having dirt on the "inside" of the Panel of a rear projection TV - it is not on the surface, you can touch and we should remove the frosted glass to blow off the dust on the back of it.

When you take a picture, the mirror reflex swings clear and the light path goes directly to the rear of the lens of the imaging sensor without ever going through the focusing - screen where it will not affect your images at all (you may have rocks upward in the room and it wouldn't affect the images).

My 5 d II camera a user replaceable lenses of sight (Canon sells optional screens) and they include a special pair of tweezers with a curved tip to make it easy to open the update screen compartment and swap screens without having to 'touch' the screen with your fingers.  But your camera is not designed to have replaced sight glasses to (although others do them.)

Although it is possible to remove the screen and clean it, do it very carefully because it is easy to damage this screen (especially if you never did before and do not know how to remove and reinsert the screen).  As the dust will not appear in an image, I would leave it alone.  If you choose to try clean in any case, it's your camera and your choice to accept the risk.  But it could lead to a more costly repair if something goes wrong.

Tags: Canon Camera

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