The Sigma Art series 24-70mm f/2.8 lens’s overall score of 31 on the Nikon D810 puts it 5 points behind the maker’s 24-35mm f/2, which is a noticeable margin. Sigma is more active than anyone else in this space, with not only an Art series 24-70mm f/2.8, but also a faster and shorter-range 24-35mm f/2, so it’s interesting to compare the performance of these with others lenses sharing a Nikon mount, including the well-liked Nikon model and its equally-respected predecessor. Image quality compared to its competitors Like others in this group, there’s a noticeable drop in sharpness at 70mm. We achieved the best results at mid-range, at 35 and 50mm, but it is a good performer at the wider end as well, albeit with some astigmatism. Our results show that sharpness is slightly improved overall, especially when used wide-open at f/2.8 from corner to corner and at the mid- and longer focal lengths where large-aperture zooms tend to struggle (even high-grade models). With an overall score of 31 on a Nikon D810 body - one of the best performing cameras available (but now superseded by the D850), the Sigma 24-70mm f/2.8 DG OS HSM A improves upon the previous Sigma 24-70mm f/2.8 IF DG HSM model, which achieved a score of 25 on the same body. However, at 107.6 x 88 mm (4.2 x 3.49 in) and 1.02 kg (36 oz), it’s quite a bit bigger and heavier than the lens it replaces, which measures 95 x 89 mm (3.73 x 3.5 in) and weighs 0.79 kg (27.87 oz). Sigma is also keen to point out that it has adopted high-grade aspherical lens elements to reduce aberrations, while at the same time paying close attention to the shape of the bokeh. In addition, the large-diameter zoom features an image stabilizer unit. It has 19 elements arranged in 14 groups, with 3 low-dispersion elements to reduce chromatic aberration. Internally, Sigma says they’ve updated the optical construction to meet the demands of ultra-high-megapixel cameras. Sigma introduced the Art version of its 24-70mm f/2.8 lens in February 2017, bringing with it the familiar-looking exterior design with a mix of metal and “thermally stable composite” material, along with rubber sealing around the mount.
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