That is good news. Glad to hear I don't need AC power to lock the mirror. I still find that using a good vacuum with your hand over the opening to ge a good seal works most of the time. But eventually it does need manual cleaning. I figured out that the day I was shooting at a baseball game the dust was far too much....see the conditions here LOL all day like that.

"The happiness of a man in this life does not consist in the absence but in the mastery of his passions."