The Sigma Macro 70mm f/2.8 EX DG Lens is a medium telephoto macro lens delivering a high level of optical performance. The 70mm is ideally suited for DSLR and 35mm SLR systems. Its design allows for shooting in all situations - both natural light or flash lighting. Its lens construction includes Special Low Dispersion lens and two high refractive index SLD lenses to provide exceptional correction for various types of chromatic aberrations while producing a superior level of optical performance. The multi-layer coating minimizes flare and ghosting and aids in creating a natural color balance. The Floating focus system gives top optical performance from infinity to 1:1 Macro. The focus limiter switch improves the speed and accuracy of AF by restricting the focus range to 25.7cm to 48cm and 55cm to infinity.