Have had this lens for about a year, still love it, have always used ultra-wides as my standard lens as it is how I view life, and this lens has become my standard. Pros of course are the very wide to super wide angle of view, sharpness and at f/4.0 throughout the whole zoom range, relatively quick for what it is, a zoom, not a prime, ultra-wide angle lens. Also like the built-in hood, very smart. Cons would be that it is large though small for what it is, could be faster like f/2.8 but then it would probably be even more expensive, do wish the lens shade hood were removable and that you could screw filters in but this would have made it more expensive and even larger. It could also have had better weather sealing but ditto, more expensive and maybe larger and heavier. Use it with my equally marvelous Panasonic GX7 which is a great camera, everything in black, very pro looking. So far my dream combo! I'm thrilled today to have read that Panasonic is continuing their partnership with Leitz and hopefully Leica lenses. My last camera was a Panasonic LX5 with the 24mm f/2.0 Leica lens that is the sharpest optic I've ever had - great combination. Good work Panasonic and Leica!
I use this lens on an Olympus body and it works great. I love the image stabilization OIS (I set my camera to use the len's stabilization first). I can handhold fully zoomed in and get sharp images even in less than ideal conditions. Auto-focus is fast considering the length and range of the lens. The most important feature is the outstanding image quality. I received the lens on a Friday and took it to an NFL training camp on Saturday. I started out with some blurry shots, but my technique improved and I was soon getting 4 out of 5 snaps. The color and rendering are excellent! I would choose this lens again without hesitation.
I bought one of these n 2009 for my G1 and use it constantly. An ultrawide lens like this on a DSLR is a rarity, and not to be missed. Truly a fantastic product.
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