Sigma has announced three new additions to its range of lenses for digital SLR cameras – the ultra wide-angle 12-24mm f/4.5-5.6 EX DG HSM II lens for full-frame DSLRs, the 50-150mm f/2.8 EX DC APO OS HSM and the 105mm f/2.8 EX DG OS telephoto Macro lens.

The 12-24mm ultra wide-angle lens features one SLD and four FLD glass elements that help compensate for colour aberration and aid good image quality. The lens also features a Super Multi-Layer Coating to help reduce flare and ghosting. Finishing off the specification is a Hyper Sonic Motor to offer quiet and high-speed autofocus, which a splash proof design allows the lens to be used in harsh conditions.

The 50-150mm telephoto zoom is both compact and lightweight, while still featuring Sigma’s proprietary OS optical image stabiliser which, Sigma claims, allows shutter speeds of approximately 4 stops slower than would otherwise be possible. The lens also features Sigma’s Super Multi-Layer Coating and Hyper Sonic Motor, as well as six SLD glass elements.

The third and final new lens is one for macro enthusiasts. The new 105mm f/2.8 EX DG OS HSM features a floating focus to compensate for aberration and deliver a high optical performance, says Sigma. The lens also features a rounded 9-blade diaphragm for attractive blur, as well as a splash-proof build.

No details are yet available on launch date or price, nor as to which mount the lenses will be release for, but we expect to be hearing more in the near future. Either visit Sigma or stay tuned to the What Digital Camera website for more information.