| 摘要 |
A variable focal length lens system with an angle of view of more than 80 in the wide-angle end state capable to focusing to a near distant object is provided. According to one aspect, a variable focal length lens system includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a fourth lens group G4 having a negative refractive power. When the state of lens positions is changed from a wide-angle end state to a telephoto end state, all the lens groups are moved to the object side such that the interval between the first lens group G1 and the second lens group G2 increases, the interval between the second lens group G2 and the third lens group G3 decreases, and the interval between the third lens group G3 and the fourth lens group G4 decreases. Each lens group from the first lens group G1 through the third lens group G3 is composed of two lens elements or more. Predetermined conditional expressions are satisfied.
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