The sigma 24-70mm f/2.8 DG OS HSM Art, nikon Fit covers a useful wide-angle
to portrait-length range of focal lengths to suit shooting in a variety of
environments. As part of the esteemed Art series of lenses, a sophisticated
optical design is used that incorporates three SLD elements and four aspherical
elements to reduce chromatic and spherical aberrations, as well as colour
fringing, distortions, and other anomalies for greater clarity and sharpness. A
Super Multi-Layer Coating has also been applied to suppress lens flare and
ghosting for accurate color fidelity and high contrast, and a protective
coating has been applied to the front element, too, to benefit working in harsh
climates. Additionally, extending its versatility, a constant f/2.8 maximum
aperture affords consistent performance throughout the zoom range as well as
greater control over depth of field.