Sigma 17-40mmF1.8 APS-C lens spy photos leaked

Sigma's new 17-40mmF1.8 APS-C format lens spy photos leaked, weighing only 530g, 11 groups and 17 elements, minimum focusing distance 0.28 meters, internal zoom design, HLA focus motor, 67mm filter diameter, belongs to Sigma Art series product line, Sony E/Leica L/Fuji X and Canon RF-S mount, equivalent to full frame 26-60mm, low dispersion and low breathing effect, slight distortion, dust and splash proof, with stepless aperture switching, released on June 17.