| 摘要 |
There is disclosed a zoom lens having, in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power and adapted to move in the zooming operation, a third lens unit for correcting the variation in the image plane resulting from the movement of the second lens unit, and a fixed fourth lens unit having a positive refractive power, wherein an aspherical surface of a predetermined shape for satisfactorily correcting the spherical aberration and the distortion aberration resulting from the zooming operation is applied onto a predetermined lens in the lens unit.
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