| 摘要 |
An objective optical system for endoscopes consisting, in the order from the object side, of a front lens unit having negative refractive power, an aperture stop and a rear lens unit having positive refractive power and comprising at least one aspherical surface in each of said lens units. This objective optical system for endoscopes has distortion of a small absolute value, a distortion curve of natural shapes, favorably corrected aberrations, and is composed of lens elements easily manufacturable.
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