JP 2025-52870A EXAMPLE 1 — NIKON / HARADA, 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 focus (Multi-Focus System): F1 (L21–L22, weak negative) and F2 (L31–L32, moderate positive) advance toward object with differential movement. Front group A and final group R are fixed. Two STM motors.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | LaK family (640601, CDGM H-LAK3) |
| L12 | Neg. Meniscus (2× Asph) | BK7 family (517641, Schott N-BK7 / OHARA S-BSL7) |
| L13 | Positive Meniscus | Ultra-high-index dense flint (921240, HOYA TAFD5F / HIKARI E-FDS3HT) |
| L14 | Negative Meniscus | S-NBH52 (738323, OHARA S-NBH52) |
| L15 | Plano-Convex Positive | S-LAH79 (954323, OHARA S-LAH79) |
| L16 | Biconvex Positive (Symmetric) | Phosphate crown ED (593670, OHARA S-FPM2 approx.) |
| L17 | Positive Meniscus | Phosphate crown ED (593670, same as L16) |
| L18 | Biconvex Positive | Phosphate crown ED (593679, OHARA L-PHM52 nearest) |
| L19 | Biconcave Negative | S-NBH52 (738323, OHARA S-NBH52) |
| L21 | Plano-Concave Negative | S-NBH55 (720347, OHARA S-NBH55) |
| L22 | Biconvex Positive | Phosphate crown ED (593679, OHARA L-PHM52 nearest) |
| L31 | Biconvex Positive (1× Asph) | PGM phosphate crown ED (593679, OHARA L-PHM52) |
| L32 | Positive Meniscus (1× Asph) | PGM lanthanum (775473, OHARA L-LAH85) |
| L41 | Positive Meniscus | Phosphate crown ED (593679, OHARA L-PHM52 nearest) |
| L42 | Plano-Convex Positive | S-NPH7 (946180, OHARA S-NPH7) |
| L43 | Plano-Concave Negative | S-NBH56 (789284, OHARA S-NBH56) |
| L44 | Biconcave Negative (1× Asph) | Barium crown / LaK family (624584, no exact catalog match) |
Detailed analysis available in the interactive viewer above.