A leaked image of Sigma 24-105mm f/4 DG OS lens now on the web. According to rumors, this lens will be announced within 6 weeks.
This Sigma 24-105mm f/4 DG OS lens will be bigger and heavier than the Canon EF 24-105 f/4L IS and Nikon 24-120mm f/4G ED VR lens. According to the source, it will have an 82mm filter, weigh 885 grams (the Canon and Nikon verisons are 670g). The lens will have 19 elements in 14 groups.