| 摘要 |
A variable focal length lens system includes first to fourth lens groups having positive, negative, positive, and positive powers, respectively, and a fifth lens group arranged in this order from an object side. When a lens zoom position is changed from a wide-angle to a telephoto, the first to fourth groups are movable and the second group is moved towards the image side and the third group is moved towards the object side so that a distance between the first and second groups increases and a distance between the second and third groups decreases, and the fourth group is moved along an optical axis direction so as to compensate for the positional change in the image plane. The fifth group includes a negative subgroup having negative power and a positive subgroup disposed on the image side of the negative subgroup and having positive power, and a predetermined condition is satisfied.
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