compensating eyepiece

• 补偿目镜

compensating eyepiece的用法和样例：

例句

1. The simple negative element Barlow increases eyepiece eye-relief.
   简单的消极因素巴卢增加目镜眼救济。
2. Looking through the eyepiece you will see two black circles.
   透过目镜你可以看到两个黑色的圆环。