Fig. 1. Schematic diagram of optical system with bifocal structure measured by far-field and near-field

Fig. 2. Spot diagram of the near-field imaging system

Fig. 3. Spot diagram of the far-field imaging system

Fig. 4. Experimental system

Fig. 5. Imaging picture of the incident parallel light through the experimental system

Fig. 6. Calibration of the near-field imaging resolution by using the resolution plate. (a) Engineering drawing of the resolution plate (part); (b) image of the resolution plate (part)

Fig. 7. Near-field experimental data

Fig. 8. Far-field experimental data

Fig. 9. Images of the pointing with the far-field shifting about 21.40″ and 24.77″. Images of the pointing (a) at 21.40″ and (b) at 24.77″

Fig. 10. Relationship between the near-field image and the far-field shifting