| 摘要 |
An optical system having an image stabilizing function includes, in order from an object side, a first lens unit of positive refractive power, a second lens unit of positive refractive power, a third lens unit of positive refractive power and a fourth lens unit of negative refractive power. During movement from a wide-angle end to a telephoto end, all the lens units move along an optical axis such that the separation between the first lens unit and the second lens unit increases and the separation between the third lens unit and the fourth lens unit decreases. The second lens unit is composed of a front lens subunit of negative refractive power, and a rear lens subunit of positive refractive power and the front lens subunit is so moved as to have directional components perpendicular to the optical axis, compensating for shake of an image.
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