| 摘要 |
A lens barrel including standard optical elements for standard photography and an insertable optical element, including a standard-optical-element drive mechanism which positions the standard optical elements on a common optical axis in a ready-to-photograph state, removes a part of the standard optical elements off the optical axis, and moves the part of the standard optical elements rearward with a part of the remainder of the standard optical elements when the lens barrel is moved to a fully-retracted state; and an insertable-optical-element drive mechanism which moves the insertable optical element between an inserted position on the optical axis and a removed position off the optical axis in the ready-to-photograph state, and moves the insertable optical element to the removed position and moves the insertable optical element rearward with the part of the standard optical elements when the lens barrel is moved to the fully-retracted state.
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