JP 2025-124346 A — Yuki Ueda
| 17 ELEMENTS / 12 GROUPS |
| DESIGN f = 48.27 mm |
| DESIGN F/1.24 |
| 2ω = 47.90° |
| 6 ASPHERICAL SURFACES / 4 ELEMENTS |
Published infinity and 395 mm test state (394.7586 mm from source spacings). G2/G4 move objectward 6.60/4.13 mm; linear intermediate movement is approximate. Limited fixed-iris model: near F/1.38 remains unreproduced. S21 clear radius 19.0 mm is inferred. Wider physical-pupil rays first clip at cement S14; full-pupil performance is not certified. Production MFD is 0.4 m.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconcave Negative | E-CF6 (HOYA equivalent) |
| L2 | Biconvex Positive | TAFD55-W (HOYA equivalent) |
| L3 | Biconvex Positive (1× Asph) | L-LAH91 (OHARA equivalent) |
| L4 | Biconcave Negative | FF5 (HOYA equivalent) |
| L5 | Positive Meniscus | TAFD55-W (HOYA equivalent) |
| L6 | Biconcave Negative | FF5 (HOYA equivalent) |
| L7 | Biconcave Negative | NBFD25 (HOYA equivalent) |
| L8 | Biconvex Positive | TAC6L (HOYA equivalent) |
| L9 | Biconvex Positive (2× Asph) | L-LAH91 (OHARA equivalent) |
| L10 | Positive Meniscus | FDS16-W (HOYA equivalent) |
| L11 | Biconcave Negative | NBFD25 (HOYA equivalent) |
| L12 | Biconvex Positive | TAC6L (HOYA equivalent) |
| L13 | Biconcave Negative | NBFD25 (HOYA equivalent) |
| L14 | Biconvex Positive (1× Asph) | NBFD13 (HOYA equivalent) |
| L15 | Biconvex Positive | TAFD40L-W (HOYA equivalent) |
| L16 | Biconcave Negative | LAF45 (HOYA equivalent) |
| L17 | Biconcave Negative (2× Asph) | M-TAFD305 (HOYA equivalent) |