针对手持热像仪较普通热像仪的特殊要求，设计了一种适用于手持热像仪长波双视场望远镜系统，该系统变倍比为2.5 倍，采用ZOOMING 型轴向移动变倍方式，采用一片透镜即可实现变倍、调焦及温度补偿功能。优化了系统光机电设计，符合手持热像仪高性能、高集成、小型化、轻量化的要求，并通过了工程实际应用及外场验证试验。

This article reports on the development of a hand-held infrared telescoping system for long-wave dual field-of-view, according to the characteristics and strict requirements of military hand-held infrared thermal cameras. The telescope with a zoom ratio of 2.5× is designed with a ZOOMING mode movement. The zoom lens can realize functions of zooming, focusing, and temperature compensation. The design result showed that the system exhibited excellent image quality, compact structure, and light weight. Moreover, it passed the practical project application and range test.