| 摘要 |
<P>PROBLEM TO BE SOLVED: To facilitate removing work for such as dust attached to an optical part arranged in an interior space of an external package. <P>SOLUTION: An external package cover unit 60 includes a lens mount 63 for attaching an exchange lens. An ND filter unit 70 is integrated with an ND filter 1, includes an aperture section 11 on a subject side of the ND filter 1 and is fixed to the external package cover unit 60. A cover glass unit 30 including a retaining member 32 for retaining a cover glass 31 is composed to be capable of attachment/detachment on a subject side in a state with the ND filter unit 70 still fixed to the external package cover unit 60. In the state having the cover glass unit 30 attached to the external package cover unit 60, the cover glass 31 seals the aperture section 11 and in a state of having the cover glass unit 30 removed from the external package cover unit 60, the ND filter 1 can be seen from the subject side through the aperture section 11. <P>COPYRIGHT: (C)2013,JPO&INPIT |
