为实现免散瞳眼底相机在被观测眼底图像较暗情况下的精确调焦，提出了双光楔裂像调焦方法。
A focusing method by adjusting two slit mark images was proposed to realize accurate focusing of a non-mydriatic fundus camera for an observed retina image in dark.
其次改变了系统的采样方式，采用双单稳态出发电路对调焦窗口进行选择，解决了原来存在的因中断产生的采样漂移问题。
Secondly we changed the sampling mode, using dual monostable multivibrators to select the focusing window, which solves the sampling drift problem raised by SCM break.
为了补偿双波段航空相机在复杂环境下产生的离焦，设计了一套调焦机构。
To compensate the defocusing of a dual-band aerial camera in a complicated environment, a focusing mechanism is designed.
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