Top features: - Ideal lens for portraits and landscapes - Rounded blades produce an attractive bokeh effect - Aberration correction across the zoom range thanks to glass and lens elements Ideal lens for portraits The Sigma 24 - 70mm f/2.8 EX DG IF HSM is ideal for portrait photography and landscapes. The f/2.8 aperture is consistent throughout the zoom range, making it easier to shot handheld indoors or in dim lighting.Rounded blades Rounded blades produces a more natural bokeh effect so you can make your subjects pop against a soft background. Aberration correction A number of elements in this 24-70 mm lens help to correct aberration in images. With Extraordinary and Special Low Dispersion glass elements and aspherical lenses image quality is kept high. Super multi-layer coating in the lens helps to reduce flare and ghosting when shooting in less than ideal conditions, so your images stay sharp.