CN 120871380 A, Example 1 — Liu Ruijun, Chen Baofeng
| 15 ELEMENTS / 11 GROUPS |
| DESIGN f = 51.1 mm |
| DESIGN F/1.47 |
| 2 ASPHERICAL SURFACES / 1 ELEMENT |
| FITTED PRESCRIPTION; INFINITY FOCUS ONLY |
Infinity focus only. The patent focuses by moving G2 (L08–L11) 7.859 mm toward the object, to a near state labelled 0.32 m with EFL 45.9 mm; the printed near gaps do not give a usable near state on the fitted radii, so close focus is not modelled. The marketed minimum focus distance is 0.45 m.
| Element | Type | Glass |
|---|---|---|
| L01 | Meniscus Negative | E-FEL1 (catalog-equivalent spectral proxy; supplier unresolved) |
| L02 | Biconcave Negative | N-SF66 (catalog-equivalent spectral proxy; supplier unresolved) |
| L03 | Biconvex Positive | S-LAH55V (catalog-equivalent spectral proxy; supplier unresolved) |
| L04 | Biconvex Positive | Unmatched (patent nd=1.949, νd=17.942; νd equals H-ZF88, so nd is probably a misprint of 1.946, unconfirmed; supplier unresolved) |
| L05 | Meniscus Positive | N-SF66 (catalog-equivalent spectral proxy; supplier unresolved) |
| L06 | Plano-Convex Positive | H-ZPK5 (catalog-equivalent spectral proxy; supplier unresolved) |
| L07 | Plano-Concave Negative | H-ZF52 (catalog-equivalent spectral proxy; supplier unresolved) |
| L08 | Meniscus Positive | S-PHM53 (catalog-equivalent spectral proxy; supplier unresolved) |
| L09 | Meniscus Negative | H-ZF1 (catalog-equivalent spectral proxy; supplier unresolved) |
| L10 | Biconvex Positive (2× Asph) | M-NBFD130 (catalog-equivalent spectral proxy; supplier unresolved) |
| L11 | Biconvex Positive | H-ZPK5 (catalog-equivalent spectral proxy; supplier unresolved) |
| L12 | Meniscus Positive | Unmatched (patent nd=1.7292, νd=56.685; supplier unresolved) |
| L13 | Biconvex Positive | H-ZF88 (catalog-equivalent spectral proxy; supplier unresolved) |
| L14 | Biconcave Negative | H-ZF7LA (catalog-equivalent spectral proxy; supplier unresolved) |
| L15 | Meniscus Negative | H-ZF88 (catalog-equivalent spectral proxy; supplier unresolved) |