The weather sealed 12-35mm is Panasonic’s new top of the range Lumix zoom with a constant F2.8 aperture. It’s also the lens most likely to be offered with the (also expected to be weather sealed) GH3. Panasonic have taken a huge step with build quality on this lens and I’m expecting the GH3 to be a big improvement in this area as well. DSLR Magazine have taken a look at…