M.Zuiko Digital ED 9-18mm F4.0-5.6 Lens, for Micro Four Thirds Cameras

It works as described. A wide-angle various focus lens

Ottime immagini per chi ama i grandangoli spinti

Arrived on time and is of great quality. Certainly enhanced my digital internal photography

This lens is a gem. It is compact and lightweight. It is also reasonably sharp at ultrawide setting. Excellent for both indoor and outdoor.

Having used this lens for a couple weeks now, I can now safely say that it's great. If I could I would give just about every good product 4.5 stars, because nothing's perfect, and neither is this lens. But I feel fine bumping it up to 5. At 9mm the lens shows considerable distortion, even for being corrected. If the in-camera correction were absent, it would be verging on obscene. But this is a wide-angle lens (though to be fair, it's not really THAT wide), so I personally expect a fair amount of distortion. It's also surprisingly sharp in the center even at f4. By 5.6 it sharpens up a bit, and softer corners definitely get better. But it doesn't sharpen up much past 5.6, and starts to lose it pretty early, around f11 or a little earlier. At 18mm, the lens is not as sharp in the center, but the lens is pretty much distortion-free. So you get essentially a 36mm 5.6 at tele with no distortion, which is a pretty good focal length, even though the aperture at that length isn't great. Close focusing distance is better than I expected (of course I didn't expect much), with macro abilities coming in at relatively weak, but certainly not terrible.Chromatic aberration? I use the E-PL2, so yes, it's there, and it could probably be better dealt with. But for me it's really not that much of an issue.The price could always be lower, but to be honest, it's not that bad for what it is. On the whole, well worth it!(Update 12.26.12)So believe it or not, I've now gone through selling all my mft gear, moving to Canon, then selling my Canon gear, moving to Nikon, then slowly adding back in MFT gear (basically because of the sensor in the OM-D). Recently I re-purchased the 7-14mm Panasonic, but was getting too many nasty purple flares (a well-documented issue with the OM-D, I was to find), so decided to go back to this little gem of a lens. I have not regretted one moment of it. Shot a wedding just recently, using both my Nikon D600 and my Oly E-M5, and hands down the best shots of the day were taken with the Oly + this lens. It's just a pleasure to use, from the light weight and compact size to the epic images, it does not disappoint. And since I use it now almost exclusively at 9mm (though the lens performs nicely throughout the range--see mention above), for me at this point the aperture is essentially fixed. One of my favorite lenses of all my gear (Nikon, Oly and Panasonic), highly recommended.(Update 11.27.13)I light of the fact that I've used both the Panasonic 7-14mm and this lens, both for extended periods, I thought I might add my two cents (though I know many others already have). The Panasonic is hands down the sharper animal. It is quite sharp for a zoom lens, in fact. In my opinion, the Oly just doesn't quite compare on this front. But, the Oly wins for size and the fact you can use filters (if that is important to you... I don't ever use them). The Panasonic is small, but the Oly is REALLY small. Both are lightweight, and both are great lenses. Yes, the Panasonic wins on the aperture, being constant. They are both excellent lenses, and I would recommend them both.However the 9mm wide on the Oly is a little easier to handle than the 7mm of the Pana. If you want super wide, there's no way you can beat the Pana. But the 9mm, to me, is a little more realistic of a focal length. Things around the edge of the frame don't look as unnaturally flat and odd on the Oly as they do on the Pana. The 9mm perspective just looks fantastic.So the extra 2mm (4mm equiv) to me ends up being unnecessary. It's fun, but I didn't end up utilizing it quite as much as I thought I would. So these things, the size, and the cheaper price, lead me to recommend the Oly over the Pana.But if you are looking for the widest you can get on m43, then there's really only one option (short of using adapters).