| 摘要 |
An optical system includes a front end 1, a rear end image relay 2, an image transfer means 5 adapted to image the aperture stop of the rear end image relay 2 to a position where it forms the entrance pupil of the optical imaging system, and aberration correcting means 6,7 including a lens 7 having an aspherical surface 7A being sufficiently aspherical that chromatic error introduced by lens 7 cancels at least a major part of the chromatic error introduced by the meniscus lens 6. The aberration correcting means may further include a multiple component lens 6C to also cancel chromatic error. The front and rear ends may include one or more mirrors in different configurations.
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