If you have only one zoom lens in your camera bag, this is the one you want. Canon 24-70mm F2.8 is from the Canon L Series professional lens range, representing the best in precision-designed EF optics. L-series lenses combine superior performance with great handling, and are resistant to dust and moisture. With a fast F2.8 maximum aperture, which stays constant over the full focal-length range, you know that you will be getting fast and sharp images without having to lose quality when zooming in and it gives you that all important control over depth of field.The lens is both manual and autofocus, with a ring-type ultrasonic motor driving the autofocus extremely quickly, and in near silence. Excellent holding torque ensures the point of focus is reached accurately, without overshooting.Featuring the latest advances in optical design, the Canon 24-70mm F2.8 ii USM brings together three aspherical elements to provide the highest possible image quality in a lens of this focal length. Significant reduction in chromatic aberration and reduced colour blur means less time in post production with an edge-to-edge sharpness usually only found in prime lenses. Super spectra coatings also give accurate colour balance and enhances contrast not to mention reducing flare and ghosting – a common problem caused by light bouncing off a camera’s sensor.