JP 2025-052870 A, Numerical Example 1 — Masaki Harada, Toshiyuki Shimada
| 17 ELEMENTS / 15 GROUPS |
| f = 34.4 mm (patent) · 35 mm (marketed) |
| F/1.23 (patent) · F/1.2 (marketed) |
| 2ω ≈ 65.4° (patent) · 63° (marketed) |
| 3 ED + 1 ASPHERICAL ED + 3 ASPHERICAL ELEMENTS |
Floating internal focus: F1 (L21–L22, weak negative) and F2 (L31–L32, positive) both move toward the object by different amounts (patent: 5.351 mm and 3.677 mm to β = −0.10). Front group A and final group R are fixed. Close state is the patent's β = −0.10 conjugate (0.472 m object-to-image, calculated); production MFD is 0.3 m.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | S-BSM81 (OHARA catalog equivalent; production supplier unspecified) |
| L12 | Neg. Meniscus (2× Asph) | J-BK7A (HIKARI catalog equivalent; production supplier unspecified) |
| L13 | Positive Meniscus | FDS24 (HOYA catalog equivalent) |
| L14 | Negative Meniscus | J-KZFH9 (HIKARI catalog equivalent) |
| L15 | Plano-Convex Positive | J-LASFH21 (HIKARI catalog equivalent; OHARA S-LAH98 / HOYA TAFD45 share the coordinate) |
| L16 | Biconvex Positive (Symmetric) | J-PSKH4 (HIKARI catalog equivalent) |
| L17 | Positive Meniscus | J-PSKH4 (HIKARI catalog equivalent) |
| L18 | Biconvex Positive | J-PSKH1 (HIKARI catalog equivalent) |
| L19 | Biconcave Negative | J-KZFH9 (HIKARI catalog equivalent) |
| L21 | Plano-Concave Negative | N-KZFS8 (SCHOTT catalog equivalent; OHARA S-NBH8 shares the coordinate) |
| L22 | Biconvex Positive | J-PSKH1 (HIKARI catalog equivalent) |
| L31 | Biconvex Positive (1× Asph) | J-PSKH1 family (HIKARI nearest; patent nd 1.59294 is 0.00025 below the catalog 1.59319) |
| L32 | Positive Meniscus (1× Asph) | M-TAF401 (HOYA catalog equivalent; production supplier unspecified) |
| L41 | Positive Meniscus | J-PSKH1 (HIKARI catalog equivalent) |
| L42 | Plano-Convex Positive | FDS18 / H-ZF75A family (946180) |
| L43 | Plano-Concave Negative | S-NBH58 (OHARA catalog equivalent) |
| L44 | Biconcave Negative (1× Asph) | Barium crown / LaK family (624584, no exact catalog match) |