CN 116520542 A — Dayong Li
| 14 ELEMENTS / 11 GROUPS |
| f ≈ 59.2 mm |
| F/2.9 |
| 2ω ≈ 39.9° |
| ALL SPHERICAL |
| 2× MACRO (MFD 0.185 m) |
Dual-group internal focusing. G2 (L3–L9 + STO) advances 47.0 mm toward object; G3 (L10–L14) advances 8.1 mm. G1 (L1–L2) fixed. Constant barrel length (internal focusing).
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | 866450 - high-index lanthanum flint (patent nd=1.86665, vd=45.0) |
| L2 | Biconvex Positive | H-ZF13 (CDGM) |
| L3 | Biconvex Positive | H-FK61 (CDGM) |
| L4 | Positive Meniscus | TAC8 (HOYA catalog-equivalent to patent 729547; supplier not identified) |
| L5 | Biconcave Negative | NBFD26 (HOYA catalog equivalent; production supplier unspecified) |
| L6 | Biconvex Positive | PBH21 (OHARA catalog equivalent; production supplier unspecified) |
| L7 | Negative Meniscus | H-ZF52 (CDGM) |
| L8 | Biconvex Positive | H-FK61 (CDGM) |
| L9 | Biconvex Positive | Unmatched (patent nd=1.89782, νd=29.90; prior H-ZLAF68N annotation rejected on dispersion) |
| L10 | Negative Meniscus | Unmatched lanthanum flint (patent nd=1.79391, νd=47.17; not catalog H-LAF4) |
| L11 | Biconcave Negative | 545486 - crown glass (patent nd=1.54517, vd=48.63) |
| L12 | Biconvex Positive | Unmatched (patent nd=1.86602, νd=41.79; prior H-ZLAF55C annotation rejected on dispersion) |
| L13 | Negative Meniscus | H-FK61 (CDGM) |
| L14 | Equi-Biconvex Positive | H-FK61 (CDGM) |