1920年，比较目镜问世。此项技术使得可以同时观察到来自两台显微镜的样品。
In 1920, the comparison eyepiece is introduced, which allows simultaneous observation of two specimens under two microscopes.
设计结果与传统凯涅尔目镜的光学性能进行了分析和比较。
The optical performance of the hybrid eyepieces are studied and compared with the Kellner eyepiece.
如果你愿意自己做一个测试，对着行星或者月亮把目镜进行比较，他们细微的差别就能体现出来了。
If you'd like to make your own test, use small details on the planets and Moon to compare one eyepiece with another. Subtle though they may be, differences will soon display themselves.
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