| 摘要 |
A zoom lens has, in succession from the object side, a first lens unit G1 having an object side surface for contact with water and having a meniscus shape having its convex surface facing the object side and having negative refracting power, a second lens unit G2 having at least two negative lenses and a positive meniscus lens having its convex surface facing the object side and having negative refracting power as a whole, and a third lens unit G3 having at least two positive lenses, a negative lens and two positive lenses disposed on the image side thereof and having positive refracting power as a whole. The first lens unit G1 is fixed relative to the image plane, the second lens unit G2 is moved from the object side toward the image side and the third lens unit G3 is moved from the image side toward the object side to thereby vary the focal length from the wide angle to the telephoto.
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