This lens is really exceptional. The image is sharp from corner to center at all apertures with maybe a little softening at 11 mm at the far corner at least in my copy, which I've seen in only one shot so far, so it shouldn't be an issue. If I had to find any flaws, it will be the fairly visible barrel distortion which goes away at about 14mm. The bad news is Adobe Lightroom's profile doesn't correct the distortion very well. The good news is the lens is small, not vey expensive and very well built. It also focuses pretty quickly on the M1 and the IS works flawlessly. I won't give it 5 stars just because of the little more than usual distortion at the short end. The other problem that isn't actually connected to the lens is the lack of viewfinder on the eos-m, which makes composing shots quite hard with a wide angle lens.
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