Zoom lens and imaging apparatus

摘要

A zoom lens consists of, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, one or two middle lens groups including a mp lens group having a positive refractive power, and a rearmost lens group disposed at the most image side position of the entire system and having a positive refractive power, wherein magnification change is effected by changing all distances between the adjacent lens groups, and focusing from an object at infinity to a closest object is effected by moving only the entire mp lens group or only a part of lens groups forming the mp lens group along the optical axis, the lens group moved during focusing includes a positive lens and a negative lens and has a positive refractive power as a whole, and given condition expressions are satisfied.

主权项

1. A zoom lens consisting of four or five lens groups as a whole, which consist of, in order from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, one or two middle lens groups including a mp lens group having a positive refractive power, and a rearmost lens group disposed at the most image side position of the entire system and having a positive refractive power,
wherein magnification change is effected by changing all distances between the adjacent lens groups, focusing from an object at infinity to a closest object is effected by moving only the entire mp lens group or only a part of lens groups forming the mp lens group along an optical axis, the lens group moved during focusing includes at least one positive lens and at least one negative lens and has a positive refractive power as a whole, and the condition expressions (1) and (2) below are satisfied:
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