Hi all,

I know I should do more searches, but I'm pretty nervous and have to know this for sure..

Went for the cherry blossoms on sat, and was switching lenses between my 50mm and 70-300, and I think I have dust on the mirror, but am not sure.

When I look thru the viewfinder, there is a pretty large black spot on the top right. I tried taking pictures with a pale background, but the pictures turn out fine, no dust spots. Am I right to conclude that the dust is on the mirror??

If so, can I use a brush on it, or a lens cloth,( I have these) or do i need to get a blower, as recommended in the manual?

will post some pics soon.