Zoom lens

A zoom lens system comprising, in order from an object side of the zoom lens system, at least a first lens group having negative refracting power, a second lens group having positive refracting power, a third lens group having negative refracting power and a fourth lens group having positive refracting power, wherein said first lens group comprises, in order from an object side thereof, a positive lens element, a negative meniscus lens element, a negative lens element and a positive meniscus lens element, and satisfies conditions (9) to (13):

• 0.5<D6/fw<1.2 (9)
• −4.0<f1/fw<−1.5 (10)
• 1.55<n1<1.8 (11)
• 1.3<R4/fw<3.5 (12)
• 37<υ1<83 (13)
• where D6 is a space between said negative lens element and said positive meniscus lens element in said first lens group, f1 is a focal length of said first lens group, fw is a focal length of said zoom lens system at a wide-angle end thereon upon focused on an infinite object point, n1 is a refractive index of a medium of said positive lens element located nearest to said object side in said first lens group, R4 is a radius of curvature of a concave surface of said negative meniscus lens element in said first lens group, and υ1 is an Abbe number of a medium of said positive lens element located nearest to said object side in said first lens group.