Fig. 1. P－ν distribution of glass materials

Fig. 2. Three groups of finite distance structure

Fig. 3. Three groups of infinite distance structure

Fig. 4. Simple diagram of initial structure

Fig. 5. The relationship between f'₁ and dt₁

Fig. 6. The relationship between f'₁ and dt₂

Fig. 7. The relationship between f'₁ and dt₃

Fig. 8. The relationship between f'₂、f'₃ and dt₂

Fig. 9. The relationship between f'₂、f'₃ and dt₃

Fig. 10. Schematic diagram of system structure with different object distances

Fig. 11. The system MTF with different object distances

Fig. 12. Diagram of object distance and position of the first component

Fig. 13. Chromated spherical aberration with different object distances