Fig. 1. Chromatic aberration of positive lens position

Fig. 2. Position chromatic aberration of negative lens and inner reverse combination element

Fig. 3. Combination of positive lens and catadioptric structure for achromatic aberration

Fig. 4. Initial structural element position

Fig. 5. Initial structure light height

Fig. 6. Chromatic aberration coefficient of front and rear group positions of catadioptric objective

Fig. 7. Catadioptric optical objective lens

Fig. 8. Full-spectrum wavefront aberration in full field of view

Fig. 9. Axial color difference curve

Fig. 10. Image aberration of catadioptric optics. (a) Field curvature; (b) distortion

Fig. 11. Center aperture ray tracing stray light

Fig. 12. Color focal shift curve