Originally posted by Michael Piziak That's reasonable for a Pentax one. I wish I had bought one before I started blowing with a rocket blower, because now I have dust debris up above the focus plate, which I'm confident the blower did that.
Yeah, that can happen -- some dust around the focus screen is pretty much inevitable, but mostly harmless. If it gets really bad you can remove the focus screen and clean it, but it's possible to scratch it while doing that, so I usually just tolerate a bit of dust in there.
Despite this issue, I still think the rocket blower is the best strategy for sensor dust. I want to avoid touching the sensor unless absolutely necessary, even with the gummy stick.