Review on Sigma 18-125mm f/3.8-5.6 AF DC OS HSM Zoom Lens for Canon DSLR Cameras by Heather Martin

The range meets most of my daily needs and the HSM is fast and quiet. Images are sharp, but there's not as much bokeh (as you'd expect). I've read many reviews complaining about the operating system's "noise", but my copy seems to make very minimal noise - I can only hear the noise if I put my ear to the lens and really try to listen. That. While the lens supports its operating system even when you're not using it, it turns off when your camera turns off automatically. Battery drain is not a big problem. The locking feature is good but only works on 18mm. Overall I would say this is a Canon 18-135 plus HSM lens. Although I prefer Canon's IS; The Sigma seems to move quite a bit even when the camera is still.