Very impressive! I have taken a good few weeks to write this review because I wanted to give it a good workout to provide a more complete review. It is heavy, but I knew that before I purchased it, not a negative, I’m just acknowledging it. That said, the focus is spot on, it feels good and provides sharp crisp images quickly. I’m really pleased with it and it meets my needs perfectly. I generally use it for nature photography. The brand seems to be good quality and works effortlessly with my Nikon. Because of that I purchased a Sigma wide angle lens too.