| 摘要 |
A zoom lens includes, from object to image side, a first unit having positive refractive power, a second unit having negative refractive power, including a negative lens member and prism from the object to image side, and being stationary during zooming, a third unit including an aperture, and fourth and fifth units having positive refractive powers. The zoom lens satisfies the following conditions: 0.20<|f2|/√{square root over ((fW·fT))}<0.45 0.80<|fN/fW|<1.90 2.70<L/fW<4.20 where fw and fT represent focal lengths of an entire system at a wide-angle and telephoto end, f2 represents a focal length of the second unit, fN represents a focal length of the negative lens member, a light-axis direction length of the prism is an air conversion length, and L represents a distance on the light axis from a second-unit lens surface closest to the object side to the aperture at the wide-angle end.
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