| 摘要 |
PROBLEM TO BE SOLVED: To realize a mounting structure that cannot be broken easily in a simple configuration.SOLUTION: An intermediate ring 2 is provided with an engagement pawl 24 that projects in a radial direction. A conversion lens 3 is provided with a first engagement wall 51 configured to restrict the relative movement of the conversion lens 3 and the intermediate ring 2 in the direction of the optical axis thereof by engaging with the engagement pawl 24 in a mounting position. Fourth and first spaces S4 and S1, in which the engagement pawl 24 is able to cross the first engagement wall 51 in the direction of the optical axis, are provided on both sides of the first engagement wall 51 in a circumferential direction thereof. The conversion lens 3 and the intermediate ring 2 are provided with torque varying parts 62 configured such that the torques of the conversion lens 3 and the intermediate ring 2 during the relative rotations increase in front of and behind the mounting position and they decrease at the mounting position. |
