Review on Canon EF-S 17-55mm f/2.8 IS USM Lens - Compatible with Canon DSLR Cameras (Lens Only) by Bogomil Bogomilov ᠌

With its pros: Constant decent aperture, ultrasonic motor, stabilizer - all this is very useful, the location of the rings for focus and zoom - everything is convenient. With its cons: One turned out to be decent, and the second has dust between the lenses, back focus and a noticeably smaller depth of field.