Sigma has revealed the 28-70mm F2.8 DG DN C (C for Contemporary), a full-frame lens designed exclusively for mirrorless cameras.
According to Sigma, the lens is based upon its Art line and has the same high optical performance.
It is said to have a similar optical design to the 24-70mm F2.8 DG DN | Art, but it’s smaller and at 470g it weighs 44% less. Sigma claims it’s currently the smallest and lightest standard full-frame zoom with a constant F2.8 aperture.
Although it uses fewer elements than the 24-70mm F2.8 DG DN | A, the 28-70mm F2.8 DG DN | C has 16 elements in 12 groups including three aspherical, two FLD, and two SLD elements. It is also said to have ‘thorough correction of axial chromatic aberration and sagittal coma aberration’.
An anti-ghosting design plus the use of Super Multi-Layer Coating and Nano Porous Coating means that flare is controlled well. There’s also a water and oil-repellent coating on the front element.
The minimum focusing distance is 19cm at the 28mm point (giving a working distance of 6.9cm) and 38cm at the 70mm end. This gives a maximum magnification ratio of 1:3.3.
The Sigma 28-70mm F2.8 DG DN C has a compact and lightweight build that’s designed for everyday use and is available in Sony E-mount as well as the L-mount, which makes it suitable for use on Panasonic S-series cameras like the Panasonic S1R as well as Sigma’s fp and Leica L-mount cameras.