| 摘要 |
PURPOSE: An apparatus for changing an optical path is provided to broaden visual field to be seen through an eyepiece by using a diffuser and to make it possible to observe dark place by irradiating light at one side. CONSTITUTION: A divided coupling portion(11) is provided at one side of a cylindrical housing(1) and has a tension as to be mounted to an optical apparatus, such as a telescope, through a binding screw. A diffuser(7) is mounted at inner surface of the housing(1) to be rotated around a shaft(5). A guiding tube(9) for irradiating light into the diffuser(7) is provided at the housing(1). By moving the diffuser(7), the diffuser(7) is rotated around the shaft(5) and an input region to an object lens of the optical apparatus is changed.
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