Nice lens. High-quality, comfortable, sharp from an open aperture. Sharpness at 300mm is slightly weaker, but very good. Fast, silent and accurate autofocus. At the long end, it can sometimes scour if there are a lot of small parts, twigs, etc. nearby. The focus easily catches a flying bird. The portraits are just wonderful. Due to the small depth of field, you can sharpen what you need, almost like on a fast fix. In general, only positive emotions, I recommend it to everyone. Camera A57.See full review