Patent ID: 7965452

Claim:
A high magnification compact zoom lens comprising; a first lens group of positive refractivity a second lens group of negative refractivity, a third lens group of positive refractivity, and a fourth lens group of positive refractivity, in order from the object side; the second lens group being movable toward the imaging plane and the fourth lens group being movable to compensate for a varied position of the resultant image while the first and third lens groups have their respective positions fixed along the optical axis, when the entire lens optics of the zoom lens are displaced from the wide-angle end to the telephoto end; and wherein the zoom lens satisfies the requirements as defined in the following formulae: f3/f4>2.0 (13) v4>65 (14) where f 3 is a focal length of the third lens group, f 4 is the focal length of the fourth lens group, and v 4 is an average of Abbe constants of all positive lens pieces in the fourth lens group.