Just Posted: our hands-on preview of the Panasonic 12-35mm F2.8 fast standard zoom for Micro Four Thirds. It's the first constant-aperture standard zoom for a mirrorless system - helping strengthen the position of the system developed by Panasonic and Olympus. We've been using a pre-production version of the lens on both makers' cameras, and have prepared a hands-on preview and a small gallery of sample images.