| 摘要 |
An image taking optical system which comprises, in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power, wherein the second lens unit moves toward the object side so that a space between the first lens unit and the second lens unit decreases, and the third lens unit moves so that a space between the second lens unit and the third lens unit changes, in a case where zooming is performed from a wide-angle end to a telephoto end, the first lens unit includes at least one lens, among which there exists only one lens that has a negative refractive power, and the second lens unit includes at least one positive lens and at least one negative lens.
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