OPTICAL SYSTEM AND IMAGE PICKUP APPARATUS

Abstract: an optical system includes, in order from an object side to an image side, a first lens unit, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit. a distance between adjacent lens units changes during focusing. the third lens unit includes a plurality of lenses. the second lens unit and the third lens unit move during focusing. predetermined inequalities are satisfied.

Inventor(s): Yuki MATSUBA, Kenji SHINOHARA

CPC Classification: G02B13/18 (OPTICAL ELEMENTS, SYSTEMS OR APPARATUS)

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