Traditional optical imaging system cannot achieve full field of view and high magnificationsimultaneously. Enslaved to resolution of detector array, the imaging field vision and magnificationcannot be satisfied at the same time. Zoom lens can only vary the magnification for the center fieldof view, and it is not able to show the large observation field of view and local optical magnifiedimage of either area at one glance. When the focal length of zoom lens reaches the long end, the fieldof vision will reduce, which leads to missing of marginal targets. The shortage of traditional imagingtechnique will entail inconvenience. In this paper, we propose a new scheme of geometrical opticsimaging system combining two imaging optical path of different focal length in one optical systemand the two optical paths image on the same detector array simultaneously. The local optical pathcan image for arbitrary position of targets and its focal length is variable using liquid lens. The finallocal variable magnification imaging optical system is shown as example. We offer the detaileddesign and simulation results, which shows that this kind of optical path configure can image forlarge field of view and arbitrary local detail at the same sight and maintain acceptable imagingperformance.
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