This lens´s most prominent feature is its outstanding portability. The rear focus system delivers sharp, clear images starting with the maximum aperture. The rapid, quiet, and accurate autofocusing is complemented by a full-time manual focus for subtle adjustments. When taking portraits even such fine adjustment as moving the focus from the tips of the eyelashes to the eye itself is possible, creating a subtle yet definite change in expressive tone. The natural soft blur effect is very attractive, and the lens´s operability is outstanding, with a constant lens length as well as a non-rotating front lens group to make using circular polarizing filters even easier.