Some years ago I had gained my fainter version of this lens. Its performance on the EOS 450D and 40D was quite solid, at the latest after the change to a 70D I was with the edge sharpness but never very happy (that's the crux of the higher resolution ...), so that the desire for an alternative grew. Since I always wanted to get into the full frame, I tested my new 6D diverse wide-angle zooms such as the Canon 17-40 and the Sigma 12-24. From both, I was a bit disappointed that edge sharpness and Verzeichung terms so I bought me neither. A more random ausprobiertes Sigma10-20 F3.5 Hatt me at the Eos 70D then convinced. Even the then ordered me at Amazon copy hat a great edge sharpness, a precise focus and a distortion that is absolutely fine with this lens type is. No comparison to the fainter version. Look and feel of the Sigma lenses are mE eh super. You have to pay good wide angle so do not necessarily change to the full-frame .... recommended at this price Very!
