This is the best wide angle lens I have ever used. The assembly is impeccable - it appears to have been assembled by a high-precision robot. There are absolutely no dust particles inside the lens - this is not the case with Canon and Nikon lenses that I have used. It's built like a mini tank with perfectly aligned outer panels and very tight tolerances. Excellent lens coating minimizes distortion - when paired with a Panasonic 4/3 camera, JPEG images perform better than RAW files corrected with Adobe Camera Raw - the in-camera processing algorithm eliminates almost all distortion. strong feelings for him. At the 7mm end, wide-angle shots focused on a close subject have a stunning 3D look. It's the only lens that makes the 4/3 system shine and that seems to be why the 4/3 system was developed.