Design of a Multi-Scale Long-Focal Imaging System Based on Tessar Primary Lenses

In order to meet the demand for accurate identification of distant targets by improving the resolution of multi-scale imaging systems, from primary lenses focus, a design scheme of a multi-scale long-focal imaging system based on the Tessar primary lenses is proposed in this paper. Two constraints that need to be added to the primary lenses for meeting the linear arrangement of secondary lenses are analyzed. In response to the problem of the imaging quali-ty degradation of the system as the off-axis angle of the secondary lenses array increases, synergy optimization is applied to the secondary lenses in adjacent areas. Additionally, free-form surface types are used to correct aberrations in the off-axis position optimization of the secondary lenses. The MTF curves of different field-of-view areas are consistent, showing that the system achieves ideal imaging quality across the full field of view. The spatial resolution of the multi-scale imaging system designed using the Tessar primary lenses structure is 14 μrad. Compared to multi-scale systems based on concentric spherical lenses, it is significantly higher.