充分考虑航空CCD相机工作环境和成像特点，设计了一款具有5000万像素的航空CCD数码相机光学系统，焦距75 mm，F数为4，畸变小于0.1%，工作温度-40 ℃～60 ℃。通过重点研究环境温度变化对数码相机光学系统成像质量的影响，提出通过无热优化的方法，保证相机在宽温度范围内具有良好的温度适应性。这种方法既能有效减小光学系统在不同温度下像面的热离焦，又有利于航空相机小型化、轻量化设计。

Optical system of an aerial digital camera based on large planar array CCD with 50 million pixels is designed, considering aerospace environment and imaging quality. The focal length of aerial digital camera is 75 mm, F number is 4，and distortion is less than 0.1%. The required working temperature is between -40 ℃～60 ℃. After carefully research on the influence of temperature on imaging quality of optical system, a new approach is put forward. Aerial digital camera can reach excellent imaging quality when soaking in a large temperature change by this new technique. This approach can not only eliminate defocusing effect of optical system caused by temperature change, but also make the aerial digital camera be smaller and less weighty.