JP 2017-227799 A — Yasunari Fukuda, Akiko Furuta, Toshinori Take, Takayuki Sensui
| 14 ELEMENTS / 11 GROUPS |
| f ≈ 28.4 mm |
| F/1.45 |
| 2ω ≈ 75.4° |
| 4 ASPHERICAL SURFACES (3 ELEMENTS) |
| 2 ED ELEMENTS (S-FPM2) |
Rear-group unit focus: Gr2 (8 elements, L21–L28 + stop) translates 6.28 mm toward the object. Gr1 fixed. Constant barrel length.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | S-TIM28 (OHARA) |
| L12 | Negative Meniscus | N-LAK8 (Schott) |
| L12r | Negative Meniscus (1× Asph) | UV-curing resin (composite) |
| L13 | Biconvex Positive | S-TIH53 (OHARA) |
| L14 | Biconcave Negative | N-BAK4 (Schott catalog-equivalent; patent supplier unspecified) |
| L15 | Biconvex Positive | S-LAH58 (OHARA) |
| L16 | Biconvex Positive | S-LAH66 (OHARA) |
| L21 | Positive Meniscus | S-LAL18 (OHARA) |
| L22 | Biconvex Positive | S-LAL14 (OHARA) |
| L23 | Biconvex Positive | S-FPM2 (OHARA) |
| L24 | Biconcave Negative | J-KZFH9 (Hikari) |
| L25 | Biconcave Negative | 806333 — dense flint (patent coordinate; vendor unresolved) |
| L26 | Biconvex Pos. (1× Asph) | L-LAH90 (OHARA) |
| L27 | Biconvex Positive | S-FPM2 (OHARA) |
| L28 | Pos. Meniscus (2× Asph) | S-LAL13 (OHARA) |