Sigma 20-60mm f/2.8-4 DG Contemporary Specs Leaked Ahead of Announcement

Sigma's 20-60mm f/2.8-4 DG Contemporary has leaked in full ahead of tomorrow's expected announcement, per PhotoRumors. The full-frame zoom uses 15 elements in 13 groups, a 67mm filter thread, and a built-in HLA motor with external zoom control. Minimum focus distance drops to 15.8cm at the 28mm position. Variable aperture steps through f/2.8 at 20-22mm, f/3.2 at 23-28mm, f/3.5 at 29-37mm, and f/4 at 38-60mm. Dimensions are 72.2x86mm and the price is listed at $849 USD.