Patent ID: 6487024
Filing Date: 2002-11-26
Classification: G02B

Abstract:
A zoom lens system comprising, in order from an object side:a first lens group having a negative refractive power; and a second lens group having a positive refractive power; wherein zooming is carried out by varying the space between the first lens group and the second lens group; wherein the first lens group includes, in order from the object side, a negative lens group G1F composed of one or two negative lens element and a positive lens group G1R; and wherein the following conditional expressions are satisfied; 4.5&lE;|X2|Â·ft/fw2&lE;15â€ƒâ€ƒ(1) 0.7&lE;|f1|/(fwÂ·ft)Â½&lE;1.3â€ƒâ€ƒ(2) where X2 denotes the maximum moving amount of the second lens group while zooming, f1 denotes the focal length of the first lens group, fw denotes the focal length of the zoom lens system in a wide-angle end state, and ft denotes the focal length of the zoom lens system in a telephoto end state.