DxOMark has tested the Sigma 24-105mm f/4 DG OS HSM Art lens. From the score, it seems this lens is another great lens from Sigma, see test result below:
Yesterday, we have posted the leaked image of upcoming Sigma 24-105mm f/4 DG OS HSM Art lens, now this lens is officially announced on Sigma US website(update: the article has been deleted). It is also one of the art series lens from Sigma, And weight of 885g, with 82mm filter.
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We have told Sigma will announced another full frame lens sometime in 2013. This rumored lens is Sigma 24-105mm f/4 DG OS HSM lens(Not sure if has optical image stabilizer).