CN 110161666A EXAMPLE 2 — 安徽长庚光学科技 / LI DAYONG
| 14 ELEMENTS / 10 GROUPS |
| f ≈ 66.0 mm (design) / 65 mm (marketed) |
| F/2.9 (design) / F/2.8 (marketed) |
| 2ω ≈ 24.3° |
| ALL SPHERICAL |
| 3 ED ELEMENTS (H-FK61) |
| 2:1 MACRO (1.95× patent) |
Inner focus — G2 (L3–L9, 7 elements) translates 35 mm forward as a rigid unit. G1 (L1–L2) and G3 (L10–L14) are fixed. Manual focus only, ~270° helicoid rotation. Patent max magnification 1.95×; production rated 2:1.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-PHM52 (OHARA) |
| L2 | Positive Meniscus | H-QF50 (CDGM) |
| L3 | Biconvex Positive | 773530 — high-index lanthanum crown (patent nd=1.77250, νd=53.00; no exact public catalog match) |
| L4 | Positive Meniscus | H-FK61 (CDGM) |
| L5 | Biconcave Negative | H-ZF7LA (CDGM) |
| L6 | Positive Meniscus | H-ZF72A (CDGM) |
| L7 | Negative Meniscus | H-ZLAF50D (CDGM) |
| L8 | Biconvex Positive | H-FK61 (CDGM) |
| L9 | Biconvex Positive | H-ZF72A (CDGM) |
| L10 | Negative Meniscus | 729577 — high-index lanthanum crown (patent nd=1.72916, νd=57.67; H-LAK52 matches nd but not νd) |
| L11 | Biconcave Negative | S-TIH14 (OHARA) |
| L12 | Biconvex Positive | S-LAH95 / TAFD25 class (904313) |
| L13 | Biconcave Negative | H-FK61 (CDGM) |
| L14 | Plano-Convex Positive | H-K8 (CDGM) |
Detailed analysis available in the interactive viewer above.