Let me start with a warning. Be aware of purchase from Electronic Basket. When I went to register with zeiss for warranty I was informed that I had a international copy and they wouldn't honor the warranty in the United States.

Build quality is outstanding! Great results if used properly. I found it hard to use on a most crowded and noisy place since I rely on my cameras focus sound as I can?t hear it when it hit the focus so you have to look at the light it get the focus. It?

Hefty, sharp, easy to use, but hefty. My wife received this for her birthday. She is a floral and garden photographer who needs resolution and focus accuracy. This lens allows her to freeze images and remain steady. For her it is heavy enough to do squats in the Body Pump Class at the Y.