于轻小型光学成像系统，小孔径限制了

图像的极限分辨率，衍射退化造成了截止频率外信息的丢失成像系统所期望的

大视场不可避免的带来边缘视场的像差恶化，各视场退化情况不同，影响信息的

判读

-Small light optical imaging system, the small aperture limit the ultimate resolution of the image, diffraction degradation aberration deterioration of the desired cutoff frequency outside the loss of information imaging system field of view inevitably bring the edge of the visual field, each referred to as field degradation, affecting the interpretation of the information