自2021年4月以来，项目已经安装并调试了两台50 cm的望远镜，并进行了测试观测。两台50 cm望远镜主要为梦飞巡天望远镜开展辅助测光，用于实时监测天空。

The twin 50-cm telescopes have been installed and commissioned, and test observations have been carried out since April 2021. They served as the Mephisto auxiliary photometric telescopes for monitoring the sky.

两台50-cm望远镜作为梦飞巡天望远镜的辅助测光设备同样位于丽江天文台。这两台望远镜的型号为Alluna RC20，带有平场改正器，光学孔径为505毫米，焦距为f/8.1。每个望远镜都安装有一个10 Micron GM4000支架，并配备了一个FLI ML 50100 CCD相机。该相机采用On Semi KAF-50100传感器，像素为8176×6132，大小为6μm（相当于投影在天空上的0.3角秒）。

As auxiliary photometric telescopes of Mephisto, the twin 50-cm telescopes, are also located at Lijiang Observatory (near to the Mephisto site). The twin telescopes are of model Alluna RC20, with a flat-field corrector, and have a 505 mm optical aperture and an f/8.1 focal ratio. Each telescope is equatorial mounted with a 10- micron GM4000 mounting, and equipped with a FLI ML 50100 CCD camera. The camera employs an ON Semi KAF-50100 sensor, with 8176 × 6132 pixels of size 6μm (corresponding to 0.3” projected on the sky).