Top features: - Wide-angle zoom with f/4 brightness across the range - Low-dispersion glass helps to correct chromatic aberration - Large-diameter aspherical lens which minimises distortion, aberration and coma flare - Hyper Sonic Motor makes autofocusing quick and reliable - Dust- and splash-proof construction that will stand up under tough conditions Wide-angle zoom Ideal for taking images of beautiful architecture and stunning landscapes, the Sigma 12-24 mm f/4 DG HSM Art Wide-angle Zoom Lens lets you shoot subjects from as close as 24 cm.With a maximum aperture of f/4 throughout the zoom range you'll be able to use higher shutter speeds to crisply capture moving leaves, flowing water, and other fast-moving subjects.Low-dispersion glassThe ART SIG575 lens works to correct chromatic aberration with three types of low-dispersion glass.These elements (extraordinary, special and “F”) combine to not only ensure colours are focused where they should be, but also provide impressive image quality.Large-diameter aspherical lensHelping to minimise aberration as well as distortion and coma flaring, the 12-24 mm f/4 has a large 80 mm diameter aspherical lens, which works with the low dispersion elements to reduce and eliminate aberrations found in other lenses.Hyper Sonic MotorAutofocusing is quick and reliable thanks to the newly designed Hyper Sonic Motor (HSM), which has more torque than Sigma's previous offering.This means even at low speeds it provides stable performance, so you can make sure you capture every shot you want.Dust- and splash-proofYou can shoot under tough conditions - get close to the ocean and continue shooting in drizzle or windy conditions - as the lens is weatherproofed with rubber sealing to protect from dust and water ingress.