Moisture and dust proof Image stabilisation Reduces ghosting and flare The Canon EF 24-70mm f/4L IS USM is a wide to mid-range zoom lens, offering the versatility to capture landscape and portrait images. The professional-level L series build quality and constant f/4 aperture means the lens is more than capable of meeting the requirements of an advanced photographer. Best suited to a full frame DSLR, the Canon EF 24-70mm f/4L IS USM is also an excellent option for the aspiring professional. Being an L series lens means the Canon EF 24-70mmL f/4 IS USM is moisture and dust proof, allowing for prolonged outdoor use, and when using slower shutter speeds the built-in Image Stabilisation maintains sharpness. The Ultrasonic Motor is quick, accurate and near silent, with the aspherical and ultra-low dispersion lens elements reducing optical aberrations, ghosting and flare. When taking shallow depth of field portraiture images the circular aperture blades produce a smooth bokeh effect, while the macro mode reduces the close focus distance to 38cm. The Canon EF 24-70mm f/4L IS USM is flanked by the Canon EF 24-70mm f/2.8L USM, which is heavier and misses out on the image stabilisation but offers a brighter maximum aperture. For the professional portrait, landscape or low light photographer the Canon EF 24-70mm f/4L IS USM is a superb companion.