Hi, I am new here - just changing all my Nikon DSLR equipment for MFT - new Panasonic GF2 bought a couple of weeks ago. I just received my Olympus 9-18mm yesterday and am returning it today as the lock switch doesn't lock the lens closed. Am I unlucky and this an unusual problem? I searched t'internet and didn't find any problems mentioned but wondered if the tiny, light weight lenses are less reliable/robust? Thanks. Keith.