| 摘要 |
PROBLEM TO BE SOLVED: To reduce space by elastically energizing plural field frame size setting member in the optical axis direction of a finder at least after finishing the setting of field frame size in a finder device provided with a means for securing the specified space of plural movable mask members 2, 3 in the optical axis direction in the midst of light passing area varying operation and reducing the space after finishing the light passing area varying operation, and switching plural field frame size by moving plural field frame size setting members in a direction orthogonal to the optical axis of the finder in the specified space in the optical axis direction. SOLUTION: The deviation of diopter on the respective sides of one field range constituted of plural movable mask members is reduced. Then, actuation load is decreased, the actuation force of a movable member is weakened, and easy changing operation and sure holding after change are realized.
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