| 摘要 |
A zoom lens system comprises, from an object to an image side: a first, a second, a third, a fourth, and a fifth lens units, wherein all units move during zooming so that an interval between the first and second lens units is larger, an interval between the second and third lens units is smaller, an interval between the fourth and fifth lens units is larger, at a telephoto end than those at a wide angle end, and an interval between the third and fourth lens units varies; and a focal length of the second lens unit, a focal length of an entire system at the wide angle end, a movement amount of the fourth lens unit in zooming from wide angle end to telephoto end, and intervals between the third and fourth lens units at the wide angle end and at the telephoto end are set appropriately.
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