| 摘要 |
An observation optical system includes an objective optical system for forming an inverted image of an object, an erecting optical system for converting the inverted image into an erected image and an eyepiece optical system for guiding the erected image to an observer. At least one of the objective optical system, the erecting optical system, and the eyepiece optical system has a first optical element having a curved reflecting surface and changes an observation magnification by changing relative positions of the first optical element and another optical unit.
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