There is only one week and about 800 pictures with me. So still "First Impressions". Everything I write is seen as compared with the EF 100-400mm L, that is with me in frequent use for 8 years. Caveat: The Sigma Canon can not replace, but complement it very well and that's why it stays with me. From what I can see so far, it is optically equivalent. The AF, if at all, only slightly slower. From the feel of her, it is inferior to the Canon as well as from "Soliditätsgefühl". The Canon is significantly faster set on a subject, as far as the neckline, also because of the zoom ring of Sigma indeed very uniform, but relatively high resistance (of the Canon very light and sensitive adjustment is) provides and ergonomically unfavorable is way ahead , In sports photography a real disadvantage. A switch to the sliding zoom mechanism of Canon`s would be a significant additional incentive to buy a "anderse" Sigma. The significantly higher weight of Sigma falls, also thanks to the large handle, little on. The stabilizer is the Sigma significantly better than the Canon. Visually, as already described, it is on par on all relevant areas, such as sharpness, contrast, vignetting (at least in the range of 100-400mm on the crop camera 7D). The color behavior is in contrast to the slight cooling of 100-400 stressed rather warm yellow. In times of EBV non-issue. The extension of the focal length range to 50mm allows many images that are simply not possible with 100 mm. The 500mm are fully usable, without clearly visible loss of sharpness. Despite the lower 6.3 Aperture and contrary to the claims, that does not work at Aperture 5.6 only with cameras above 5D and 7D AF zuverläassig is wrong as a result simply. This is the AF is not switched off, is simply because the lens of the camera, "says" electrically there be a 5.6 (in the viewfinder will also appear so). The decision is quickly made to keep as "Always top". Not even nothing for fast sports and rainy weather, the Canon remains indispensable, also because, the panel may at Canon close to 32 (38), while Sigma only to 22, which at deliberately used long shutter speeds (Mitzieher) changes and lots of light, a real disadvantage of the sigma is. Price / performance voices each other well!
