| 摘要 |
The wide angle objective disclosed is composed of eight components. The first counting from the front is a negative meniscus lens of forward convexity. The second component is a positive lens with a front surface of strong positive power, and the third is a biconcave lens having a strong surface facing the rear. The fourth component is a positive lens with a front surface of strong positive power and the fifth is a doublet lens of positive power with its front surface convex toward the front and with its cemented surface of positive power convex torward the rear. The sixth component is a biconcave lens, the seventh is a positive doublet lens convex toward the rear and consisting of a negative lens element and a positive lens element cemented together at their adjoining surfaces, and the eighth is a positive lens with its rear surface being stronger in power than its front surface. In focusing the objective, as the entire lens system is axially moved as a whole relative to the image plane, the first and second components and moved as one fixed group and the third to eighth components as another fixed group are moved as another fixed group in differential relation to the first fixed group.
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