JP 2016-090725 A — Hiroaki Tanaka
| 10 ELEMENTS / 9 GROUPS |
| f ≈ 60.0 mm |
| F/2.8 |
| 2ω ≈ 26.6° |
| 4 ASPHERICAL SURFACES |
Inner focus: Gr2 (L21–L23) moves toward object; Gr1, stop, and Gr3 fixed. β = −1.0 (1:1) at MFD.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive | S-TIH53 (OHARA) |
| L12 | Pos. Meniscus (2× Asph) | S-BAL42 (OHARA) |
| L13 | Biconcave Negative | S-TIM28 (OHARA) |
| L21 | Biconvex Positive | FCD100 (HOYA) |
| L22 | Negative Meniscus | NBFD15 (HOYA) |
| L23 | Pos. Meniscus (2× Asph) | S-BAL42 (OHARA) |
| L31 | Positive Meniscus | TAFD35 (HOYA) |
| L32 | Biconcave Negative | 517522 — crown (patent coordinate; vendor unresolved) |
| L33 | Negative Meniscus | 569560 — barium crown (patent coordinate; vendor unresolved) |
| L34 | Biconvex Positive | S-LAL18 (OHARA) |