| 摘要 |
An objective lens system comprising a first lens unit composed of a cemented lens component which comprises a plurality of radial type gradient index lens elements having refractive indices varying dependently on distances as measured from an optical axis, wherein a gradient index lens element disposed on the object side has a concave surface on the object side. This objective lens system favorably corrects longitudinal chromatic aberration, offaxial aberrations and chromatic aberration, and is configured so as to facilitate the manufacture of the gradient index lens elements in practice.
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