JP 2024-107941 A — Yoshihisa Yomogida, Yuki Shibata
| 8 ELEMENTS / 5 GROUPS |
| f ≈ 28.900 mm |
| F/2.85 |
| 2ω ≈ 74.8° |
| 2 ASPHERICAL SURFACES |
NO_INTERNAL_RECONSTRUCTION: Example 3 publishes only infinity data. The optical family has 0.5 m (VM Type II) and 0.7 m (VM Type I/L39) production endpoints, but no focus motion is modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconcave Negative | S-BSL7 (OHARA) |
| L2 | Biconvex Positive | TAFD35L (HOYA) |
| L3 | Biconcave Negative | FDS90-SG (HOYA; FDS90 has identical optical constants) |
| L4 | Biconcave Negative | E-FD8 (HOYA) |
| L5 | Biconvex Positive | TAFD30 (HOYA) |
| L6 | Biconvex Positive | TAFD30 (HOYA) |
| L7 | Biconcave Negative | E-FD2 (HOYA) |
| L8 | Neg. Meniscus (2× Asph) | 806-407 class (HOYA NBFD13 / M-NBFD130; process unresolved) |