Fig. 1. Optical structure simplified diagram of anti-long distance lens

Fig. 2. Structural type of transmission solar-blind ultraviolet optical system with ultra-wide angle

Fig. 3. Simplification and light path diagram for initial structure for transmission solar-blind ultraviolet optical system with ultra-wide angle

Fig. 4. Optical structure and light path diagram of the optimized optical system

Fig. 5. Spot diagram with the half field of view angle of 0° (a)、35° (b) and 50° (c) of the optimized optical system

Fig. 6. Modulation transfer function curve diagram of the optimized optical system

Fig. 7. Relative illumination curve of the optimized optical system

Fig. 8. Diffraction encircled energy curve of the optimized optical system