| 摘要 |
An attachment device, such as a protective cap, is attachable to an interchangeable lens that includes a diaphragm mechanism having a plurality of diaphragm blades overlapping one another to form a diaphragm and a diaphragm interlocked member interlocked with the diaphragm blades and urged for stopping down the diaphragm. The attachment device includes a diaphragm retaining member that drives the diaphragm interlocked member to a position to open the diaphragm larger than the minimum aperture, when the attachment device is attached to the interchangeable lens.
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