US 4,163,603 — Teruyoshi Tsunashima
| 11 elements / 10 groups |
| f ≈ 24.0 mm |
| F/2 |
| 2ω = 84° |
| CRC production focus |
Production lens uses Nikon CRC close-range correction; a pure unit-extension proxy would add about 2.79 mm at 1:8.6, but US 4,163,603 publishes only the infinity prescription, so this file leaves focus gaps fixed.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | N-SSK5 (SCHOTT; S-BSM25/BACED5 class) |
| L2 | Negative Meniscus | S-LAL8 (OHARA) |
| L3 | Negative Meniscus | S-LAL14 (OHARA) |
| L4 | Biconvex Positive | N-SSK5 (SCHOTT; S-BSM25/BACED5 class) |
| L5 | Negative Meniscus | S-LAL14 (OHARA) |
| L6 | Biconvex Positive | 750350 lanthanum flint class (S-LAM7 close, OHARA) |
| L7 | Positive Meniscus | N-SK11 (SCHOTT) / BACD11 (HOYA) |
| L8a | Positive Meniscus | 743494 lanthanum flint class (S-LAM60 close, OHARA) |
| L8b | Biconcave Negative | S-TIH6 (OHARA; SF6 class) |
| L9 | Positive Meniscus | 743494 lanthanum flint class (S-LAM60 close, OHARA) |
| L10 | Biconvex Positive | S-LAL14 (OHARA) |