连续变焦光学系统在执法取证、森林防火、海洋搜救、道路交通、无人机侦察等领域有着广泛且必不可少的实际应用。为提高变焦系统的性能指标，并使系统小型化，通过 Zemax光学设计软件反复优化计算，设计了焦距为 2.68～17.5 mm、视场为 4.7°～31°的变焦系统。整个系统由 4组 10片透镜组成，物镜的像方 F数为 2.15～3，MTF值在 250 lp/mm时均大于 0.25，畸变在 4.5%以内，光学总长小于 27 mm，总质量小于 0.77 g，具有结构紧凑、体积小、重量轻、分辨率高、成像质量好等优点，是一款微小型的连续变焦光学系统。

Continuous zoom optical system has extensive and essential practical applications in the field, such as law enforcement and evidence collection, forest fire, maritime search rescue, road traffic, unmanned aerial vehicle reconnaissance. In order to improve the zoom system performance index, and realize the miniaturization of system, the focal length of 2.68 mm to 17.5 mm, 4.7°-31° field zoom system is designed by using the Zemax optical design software and optimization calculation. The whole system is composed of four groups of ten pieces of lens. The F number is 2.15-3. The MTF curve at 250 lp/mm is greater than 0.25. Distortion is within 4.5%. The optical length is less than 27 mm. Total mass is less than 0.77 g. The system has a compact structure, light weight, high resolution, excellent image quality, etc, which is a miniaturization of microminiature continuous zoom.