CN 121091494 A, Example 1 — Liu Ruijun, Chen Baofeng
| 12 ELEMENTS / 9 GROUPS |
| 14mm MARKETING / 14.192mm MODELED EFL |
| f/4 MODELED APERTURE |
| 112.6° FULL FIELD |
| 4 ASPHERICAL SURFACES |
| INNER FOCUS |
Internal focus: G2 (L7-L9) translates 1.10 mm objectward from infinity to the patent's nominal 0.12 m endpoint. The modeled close state uses D1=3.75 mm and mechanism-constrained D2=4.56 mm (printed D2=4.65 mm). The close-focus distance is the patent's 0.12 m; Viltrox markets 0.13 m.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | 923209 class |
| L2 | Neg. Meniscus (2× Asph) | J-FKH1 equivalent (qualified spectral proxy for rounded patent 1.50 / 81.6; vendor unresolved) |
| L3 | Negative Meniscus | 592683 class |
| L4 | Biconvex Positive | 648338 class |
| L5 | Biconcave Negative | 678555 class |
| L6 | Biconvex Positive | 670472 class |
| L7 | Biconvex Positive | 459902 class |
| L8 | Negative Meniscus | 001254 class |
| L9 | Biconvex Positive | 459902 class |
| L10 | Biconcave Negative | Unmatched (patent nd=1.78 / vd=25.7; rounded coordinates do not pass catalog guard) |
| L11 | Pos. Meniscus (2× Asph) | Unmatched (nd≈1.64, νd≈23.5) |
| L12 | Near Plano-Convex Positive | 593686 class |