CN 120686438 A, Example 1 — Liu Ruijun, Chen Baofeng
| 15 ELEMENTS / 11 GROUPS |
| DESIGN f = 86.5 mm |
| DESIGN F/1.47 |
| 2 ASPHERICAL SURFACES / 1 ELEMENT |
| INFINITY FOCUS ONLY |
Infinity focus only. In the patent the second group (L07–L09) moves about 11.5 mm toward the object for close focus: D1 17.456 → 5.96 mm and D2 3.501 → 14.994 mm at 0.79 m. That state is not modelled because the fitted aspheric coefficients do not reproduce the patent's close-focus aberration curves.
| Element | Type | Glass |
|---|---|---|
| L01 | Positive Meniscus | FDS18 (catalog-equivalent spectral proxy; supplier unresolved) |
| L02 | Positive Meniscus | K-GFK70 (catalog-equivalent spectral proxy; supplier unresolved) |
| L03 | Positive Meniscus | H-ZPK5 (catalog-equivalent spectral proxy; supplier unresolved) |
| L04 | Positive Meniscus | H-FK61 (catalog-equivalent spectral proxy; supplier unresolved) |
| L05 | Negative Meniscus | NBFD25 (catalog-equivalent spectral proxy; supplier unresolved) |
| L06 | Negative Meniscus | NBFD25 (catalog-equivalent spectral proxy; supplier unresolved) |
| L07 | Biconcave Negative | F2 (Schott; catalog-equivalent spectral proxy; supplier unresolved) |
| L08 | Biconvex Positive | H-ZLaF68C (catalog-equivalent spectral proxy; supplier unresolved) |
| L09 | Biconvex Positive (2× Asph) | M-TAF105 (catalog-equivalent spectral proxy; supplier unresolved) |
| L10 | Positive Meniscus | H-ZLaF50E (catalog-equivalent spectral proxy; supplier unresolved) |
| L11 | Biconcave Negative | S-TIH3 (catalog-equivalent spectral proxy; supplier unresolved) |
| L12 | Biconvex Positive | H-ZF88 (catalog-equivalent spectral proxy; supplier unresolved) |
| L13 | Biconvex Positive | H-ZLaF68C (catalog-equivalent spectral proxy; supplier unresolved) |
| L14 | Biconcave Negative | H-ZF52 (catalog-equivalent spectral proxy; supplier unresolved) |
| L15 | Negative Meniscus | H-ZLaF76 (catalog-equivalent spectral proxy; supplier unresolved) |