ZOOM LENS

摘要

PROBLEM TO BE SOLVED: To provide a zoom lens, favorably correcting the spherical aberration variation at the telephoto end by only one group inner focus system or a rear focus system without moving two or more groups in focusing. SOLUTION: In this telephoto type zoom lens, a first group having positive refracting power, a second group having negative refracting power and a following rear group having positive refracting power as the whole are provided in order from the object side. The second group includes a meniscus negative lens in which convex surfaces are directed toward the object in order from the object side and a cemented lens of at least a negative lens and a positive lens. In the inner focus zoom lens without a floating focus, when R is radius of curvature of the object side surface of the lens of the second group, which is located closest to the object, f(wide) is a focal distance at the wide-angle side of the whole lens system, andω(wide) is a half field angle at the wide angle end, the following two conditional expressions are satisfied: (1) 1