I had thoughts of a macro lens for a while, but did not know if I've wanted to put out at least 4000 - in a relatively sensible objective.
By chance I find later this macro on Cnet with a severely reduced price.
The fact that I already owned the Sigma 70-300 DG, which provides unimpressive pictures, so I did not have too high expectations for this lens.
But oh, so pleasantly surprised I was! Sharp images with very little, on the border with no chromatic aberration. The only negative might be the focus that has little trouble finding and that it sounds a lot, but it can certainly live with, considering the price and results.
Along with my Canon EF 50/1, 8, so this is now my favorite lens.