Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Sharp Lens, but flawed

Probably the best thing about this lens is that it is almost up to par with Olympus. At best, it is sharp, with beautiful bokeh, etc, etc. Typical quality we expect from Leica-like optics (this isn't really a leica lens, but as close as you can get from Panaasonic's factories.) The bad thing is that it is not nearly as well built as Olympus. No moisture protection, so with an E-3 not a great fit. Also, it suffered from the all-too-typical "Zoom Lock" problem. A screw gets loose and it won't zoom past 25mm or so. It was a fairly easy fix, but not for everyone. A little irritating for a lens costing this much. If you suffer from this problem, please search out on the internet for the repair instructions. The fix is available for the brave ones out there. That having been said, I do like this lens. Just not as much as my spectacular 12-60mm or 11-22, which are almost bullet-proof.