| 摘要 |
A lens barrel includes a variable power lens unit, an aperture-variable light-amount adjusting unit having an adjusting member that adjusts the fully open state of the aperture, and a variable power lens control mechanism that shifts the variable power lens unit from a first variable power position to a second variable power position. The variable power lens control mechanism moves the variable power lens unit beyond the second variable power position, then returns it toward the second variable power position, and stops it at the second variable power position. The lens barrel further comprises a cam member having a cam portion with which the adjusting member is engaged, and moves relative to the light-amount adjusting unit in operative association with the control action of the variable power lens control mechanism.
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