Review on Sigma 18-35mm F1.8 Art DC HSM Lens - Canon Compatible, Black (210101) by En Xiao ᠌

I bought the lens through the official store (PCT), after long wanderings around the Internet, in search of a universal fast lens for crop (Canon eos 70D). A month later, I handed it over to the service center, as it smears at 100%, moreover, either at "+" or at "-", without any regularity, I tried both auto and manual, in general I tried all modes, only when focusing on Live View can achieve great results, but it's slow and drains your battery. The service said that it is possible to solve the problem with the Canon 70d in 1 out of 10 cases. Will wait! If they don't fix it, I'll return it as defective. As a result: the lens is really good, but not suitable for all carcasses. I would like manufacturers not to hide compatibility problems with certain camera models, as this spoils the overall impression of the brand.