JP 2025-108279 A — Yoshihisa Yomogida, Yuki Shibata
| 8 ELEMENTS / 6 GROUPS |
| EFL 49.101 mm MODEL / 49.10 mm PATENT |
| 50 mm / f/3.5 MARKETED |
| F/3.56 / 2ω = 47.88° PATENT |
| 45.7° MARKETED AOV |
| 4 APD ELEMENTS (MANUFACTURER-MARKED) |
Published whole-lens unit focus; no finite-distance optical state is encoded. Type II reaches 0.35 m and Type I reaches 0.45 m with the same prescription.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus, convex to object | 487704 — low-dispersion crown; vendor identity not unique |
| L2 | Positive Meniscus | 883408 — high-index lanthanum crown; vendor identity not unique |
| L3 | Biconvex Positive | 729547 — lanthanum crown; vendor identity not unique |
| L4 | Biconcave Negative | 603380 — F5-class flint; vendor identity not unique |
| L5 | Biconcave Negative | 567428 — FL6/S-TIL26-class light flint; vendor identity not unique |
| L6 | Biconvex Positive | 497816 — FCD1/S-FPL51/N-PK52A-class fluorophosphate crown; vendor identity not unique |
| L7 | Biconvex Positive | 713539 — LAK8/LAC8-class lanthanum crown; vendor identity not unique |
| L8 | Negative Meniscus, convex to image | 689312 — FD8/SF8/S-TIM28-class dense flint; vendor identity not unique |