The numerous discussions on sensor cleaning on this group prompt me to ask the following. Has anyonone using the blower method experienced problems with debris being blown onto the focussing screen's upper surface between the screen and the pentaprism? When using a child's ear-syringe as a blower many years ago on the mirror of my Minolta film cameras, I would sometimes get "lint" into that area causing it to be visible (and highly annoying) through the viewfinder. I haven't seen anyone on the groups mention this and wonder if the air pressure produced by "rocket" blowers, etc. is less than I was using. Or perhaps raising the mirror effectively "seals off" the edges around the viewing screen in a DSLR. I have been reluctant to use a blower on my DSLR because of that nagging fear.