Patent ID: 7173770

Claim:
An imaging apparatus comprising: a zoom lens; and a field stop for determining an extent of an imaging field, arranged on an image side of the zoom lens, the zoom lens comprising, in order from an object side, a first lens group having positive refracting power, a second lens group having at least three lens elements and having positive refracting power, and a third lens group consisting of one single lens element and having negative refracting power, wherein zooming from a short focal length end to a long focal length end is performed by moving each of the lens groups to the object side, and wherein the following conditions are satisfied: 3.0 <ft/fw 0.7 <IH/fw <0.9 1.75 <ft/fl â€” G 1<2.5 2.8 <fw/sk â€” w <4.1 where ft is a focal length of the zoom lens at the long focal length end, fw is a focal length of the zoom lens at the short focal length end, IH is a maximum image height, fl_G 1 is a composite focal length of the first lens group, and sk_w is a backfocus at the short focal length end.