good used one is great buy. Also this is Sigma 17-70mm f2.8-4 alternative
11 September 2014
Summary: Smooth Zoom and good build quality, good image quality for the price. OS is definitely plus to have steady shots. Also HSM enables to work with Nikon low end camera such as D40/D40x which do not have lens motor.
Summary: I bought this lens because my original Canon lens was broken. For my amateur needs, it is very satisfying. The 1:2.8 aperture is great, and the building seems to be strong. The built-in zoom system is very interesting. The only con is that this lens is heavier than the original Canon.
Summary: I bought this lens instead of Pentax lens. I use this lens for boyscout activity. The lens is responding quick with auto focus. The picture is good. Specially in the shade I can open the aperture without the flash. I am happy with this lens.