The D camera eyepiece is attached to the spotting scope instead of a standard observationeyepiece.
照相机目镜可作为附加件用于观鸟镜，代替标准的目镜使用。
2
Observationeyepiece consists of concave mirror and a separate gate is formed, in the eyepiece can be seen at the same time the two semicircle color, its left for the sample color.
观察目镜由凹镜和分隔栅组成，在目镜中可同时看到二个半圆色，其左边的为试样颜色。
3
In 1920, the comparison eyepiece is introduced, which allows simultaneous observation of two specimens under two microscopes.