I read a few of the other threads about mirror lock, which some of you seem to do, but the manual (a100) says not to keep it locked up for long, just a quick cleaning, and that you must use a fully charged battery. So I ask those of you who do use lockup: just what are you doing? Ignoring the recommendation of the "short time" use? I'd love to take some long exposures and minimize any and all chance of shake. I have a kick-butt tripod and a cable release, so the mirror is my final challenge.
Thanks so much!