ZOOM LENS, IMAGING OPTICAL DEVICE, AND DIGITAL EQUIPMENT

WIPO Patent Application WO/2014/010504

A1

A zoom lens comprising a negative first lens group and a positive second lens group, in said order from the object side, and implementing variations in magnification by changing the intervals between the groups. The second lens group includes a three-piece cemented lens comprising a negative first lens, a positive second lens, and a negative third lens, in said order from the object side, and satisfies the conditional expression 0.08<(rs2+rs1)/(rs2-rs1)<0.5, 27