US 2020/0142168 A1 Example 1 — Nikon / Harada
| 20 ELEMENTS / 16 GROUPS |
| f = 24–70 mm |
| F/2.8 |
| 2ω ≈ 84.4–34.4° |
| 4 ASPHERICAL SURFACES |
Inner focus: G21 (L21–L25, 5 elements) moves rearward 6.735 mm. Front element and rear group fixed during focus.
| Element | Type | Glass |
|---|---|---|
| L11 | Neg. Meniscus (1× Asph) | 744495 — lanthanum crown (patent nd=1.74389, νd=49.50; no exact public catalog match) |
| L12r | Asph. Resin Layer | UV-curing resin |
| L12g | Biconcave Negative | S-LAH65V (OHARA) |
| L13 | Positive Meniscus | S-LAH99 / TAFD55 (001291, HRI) |
| L21 | Biconvex Positive | 593670 - fluorophosphate crown (patent nd=1.59349, vd=67.00) |
| L22 | Positive Meniscus | 593670 - fluorophosphate crown (patent nd=1.59349, vd=67.00) |
| L23 | Biconvex Positive | 593670 - fluorophosphate crown (patent nd=1.59349, vd=67.00) |
| L24 | Biconcave Negative | S-LAH95 (OHARA) |
| L25 | Biconvex Positive | S-LAH66 (OHARA) |
| L26 | Biconvex Positive | S-LAH59 (OHARA) |
| L31 | Biconcave Negative | S-LAH65V (OHARA) |
| L32 | Neg. Meniscus (concave obj.) | S-PHM53 (OHARA) |
| L33 | Biconvex Positive | S-TIH53 (OHARA) |
| L34 | Biconcave Negative | 593670 - fluorophosphate crown (patent nd=1.59349, vd=67.00) |
| L35 | Positive Meniscus | S-TIH6 (OHARA) |
| L41 | Biconvex Positive (1× Asph, ED) | 553717 - ASP/ED fluorophosphate crown (patent nd=1.55332, vd=71.70) |
| L42 | Neg. Meniscus (concave img.) | S-LAH55 (OHARA) |
| L43 | Biconvex Positive | 593679 - fluorophosphate crown (patent nd=1.59319, vd=67.90) |
| L44 | Biconvex Positive | S-FPL51 / FCD1 class (ED fluorophosphate, vd=82.6) |
| L45 | Biconcave Negative | S-TIH6 (OHARA) |
| L46 | Pos. Meniscus (1× Asph) | 694533 - lanthanum crown (patent nd=1.69350, vd=53.30) |
Detailed analysis available in the interactive viewer above.