为了进行近距离测量,需要有K400那样的伺服性能和通用性,并具有小型,容易运输和容易装拆等优点的经纬仪和跟踪架。把K400的光学系统去掉主望远镜的所有光学部件,只留下两块偏转反射镜,就得到叫做“小毒蛇”的反射镜头部。(小毒蛇是丛林中一种小的,敏捷的,从不丢失目标的蛇。)当然保留所有其他附件,多台相机,可换的跟踪器,具有平 For close-range measurement, there is a need for servo performance and versatility such as the K400, as well as theodolites and tracking shelves that are small, easy to transport, and easy to assemble and disassemble. The K400 optical system to remove all the optical components of the main telescope, leaving only two deflection mirrors, get called “serpentine” mirror head. (Serpent is a small, agile jungle that never loses its target.) Of course, all other accessories, multiple cameras, changeable tracker, flat