The other day I was setting my camera up for a day out, when as I looked through the view finder, I noticed a dust spot in the top right of my AF markers and one to the left. I also noticed two black dots in the bottom left corner, about the size of fullstops. Now, I removed my lens and used a rocket air brush to clean both the lens, mirror, even the sensor but alas, when I looked through the view finder again they were still there!
I must add that I took some test shots of the blue sky to see if they appeared on the picture, but they dont. It's also interesting to note that they dont appear in "live view" on the lcd screen. Could dust have got up into the view finder? I have a Canon EOS 600D.
Any help would be appreciated, as it's more of an annoyance than anything else.