![]() The two main third-party rivals from Tokina and Tamron share a similar overall level of optical quality, with the former boasting marginally higher sharpness levels when stopped down, and excellent transmission. Intriguingly, the latest Nikkor and its predecessor can’t quite match the performance of the third-party offerings, though they’re very close despite both having quite high levels of lateral chromatic aberration. 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 With an overall score of 31 on a Nikon D810 body - one of the best performing cameras available (but now superseded by the D850), the Sigma 24-70mm f/2.8 DG OS HSM A improves upon the previous Sigma 24-70mm f/2.8 IF DG HSM model, which achieved a score of 25 on the same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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