| 摘要 |
The optical system provided with a first optical part disposed most adjacent to the object side, the optical part having three or more optical surfaces, of which at least one is a reflecting surface, and an aperture stop disposed more adjacent to the image side than the first optical part, wherein when the spacing from the first optical surface to the third optical surface as counted from the object side of the first optical part is defined as D and the spacing from the first optical surface to the entrance pupil at an azimuth &xgr; degrees is defined as X(&xgr;), the following condition is satisfied:The specification also discloses an optical apparatus provided with such optical system.
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