US 2026/0086332 A1 — Yukihiro Yamamoto
| 17 ELEMENTS / 13 GROUPS |
| DESIGN f = 131.00 mm |
| DESIGN F/1.46 |
| 2ω = 18.16° |
| 4 ASPHERICAL SURFACES / 2 ELEMENTS |
PUBLISHED: fixed front/rear groups and iris; GrFC1 moves imageward and GrFC2 objectward. Three tabulated states are preserved at infinity, 2.4070992 m and 1.1040276 m object-to-image. Between-state gap interpolation is illustrative, not a published cam law. Marketed minimum focus is 1.1 m.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | FDS20-W (HOYA) |
| L2 | Positive Meniscus | FCD100 (HOYA) |
| L3 | Positive Meniscus | FCD100 (HOYA) |
| L4 | Positive Meniscus | S-FPL53 (OHARA) |
| L5 | Negative Meniscus | TAFD37A (HOYA) |
| L6 | Positive Meniscus | S-FPL53 (OHARA) |
| L7 | Negative Meniscus | NBFD25 (HOYA) |
| L8 | Positive Meniscus Aspheric | M-BACD12 (HOYA) |
| L9 | Negative Meniscus | TAC6 (HOYA) |
| L10 | Negative Meniscus | FDS90-SG (HOYA) |
| L11 | Positive Meniscus | TAC8P (HOYA) |
| L12 | Biconvex Positive | TAFD33 (HOYA) |
| L13 | Negative Meniscus | S-NBH59 (OHARA) |
| L14 | Biconvex Positive | FDS18-W (HOYA) |
| L15 | Biconcave Negative | FD140 (HOYA) |
| L16 | Biconvex Positive | TAFD40-W (HOYA) |
| L17 | Biconcave Negative Aspheric | M-BACD12 (HOYA) |