Sigma 24-70mm f/2.8
Sigma 24-70mm f/2.8 DG DN Art is a versatile wide-angle to portrait-length zoom characterized by its f/2.8 constant maximum aperture. The bright design suits working in available lighting conditions and also affords increased control over depth of field. The optical design incorporates a series of low dispersion and aspherical elements. Also, greatly reduce a variety of aberrations in order to achieve high sharpness, enhanced clarity, and improved colour accuracy. Both Super Multi-Layer and NanoPorous Coatings have also been applied to improve contrast. And colour rendering by suppressing lens flare and ghosting when working in strong lighting conditions.
Complementing the optical attributes, this lens also sports a stepping AF motor. Which yields fast, precise, and notably quiet autofocus performance. At the wide end of the zoom range, a maximum magnification ratio of 1:2.9 suits working with close-up subjects. And an 11-blade diaphragm contributes to a pleasing bokeh quality. Additionally, a weather-sealed design benefits working in trying environmental conditions.
Six F Low Dispersion (FLD) and two Special Low Dispersion (SLD) elements markedly reduce chromatic aberrations and colour fringing throughout the zoom range for improved clarity and colour accuracy.
Three aspherical elements control spherical aberrations and distortion for increased sharpness and accurate rendering.
At the wide-angle end of the zoom range, a minimum focusing distance of 7.1″ is possible with a maximum magnification of 1:2.9 to suit working with close-up subjects. At the telephoto end, the minimum focusing distance is 1.25′ with a maximum magnification of 1:4.5.
Rounded 11-blade diaphragm contributes to a pleasing bokeh quality.