Before buying the telephoto lens I looked at a lot of reviews and various recordings. I find this part simply superb. If you read the negative reviews, the ladies or gentlemen should even be aware that price differences of 300 up to 10,000 course somewhere should be reflected in the product. I can not compare a Fiat Panda to a Jaguar upscale !! I've even ordered the 2x teleconverter and am absolutely satisfied with these two products. With so many bemängelnden jerky motion when zooming you can already live. It's a little getting used to, but does not diminish the image quality of course. As I said, at this price this quality, I can recommend with a clear conscience.