Patent ID: 7773308

Claim:
A wide-angle zoom lens comprising: a plurality of groups of lens pieces including a 1st lens group of negative refractivity; a 2nd lens group of negative refractivity; and a 3rd lens group of positive refractivity all lens groups arranged in the recited order on a closer to objects first basis, that varies power from a wide-angle end to a telephoto end with the 1st and 2nd lens groups coming closer to each other, and the 2nd and 3rd lens groups being varied in interval therebetween, the zoom lens attaining a field of view wider than 80 degrees in field angle, satisfying the requirements in the following formula: 2.0 <ft/fw where fw is the focal length of the entire optics when the zoom lens gets set at the wide-angle end, and ft is the focal length of the entire optics at the telephoto end and wherein the zoom lens varies the power, satisfying the requirements as in the following formulae: 0.8 <|f 1 /fw|< 3.0 and 1.5 <f 3 /fw< 4.5 where f1 is the focal length of the 1st lens group, f3 is the focal length of the 3rd lens group, and fw is the focal length of the entire optics when the zoom lens is at the wide-angle end.