结构紧凑，变焦行程短， 变焦轨迹平滑，像面稳定。

The structure is compact, zoom distance is short and zoom track is smoothness, The image plane is tranquilization.

youdao

结构紧凑，变焦行程短， 变焦轨迹平滑，像面稳定。

The structure is compact, zoom distance is short and zoom track is smoothness, The image plane is tranquilization.

youdao