US 4,062,630 — Sei Matsui
| 6 elements / 4 groups |
| Ai Nikkor 135mm f/2 (1977–2005) |
| f = 100 mm patent (×1.35 → 135 mm production) |
| Tele-Sonnar / Ernostar variant |
Unit focusing — entire optical assembly translates forward; only BFD changes
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | S-LAM3 (OHARA) |
| L2 | Negative Meniscus | 626391 — barium flint (patent coordinate; vendor unresolved) |
| L3 | Positive Meniscus | OHARA S-BAL35 / HOYA BACD5 (589/612) |
| L4 | Plano-Convex Positive | FD3 (HOYA catalog-equivalent; production supplier unspecified) |
| L5 | Biconcave Negative | HOYA E-FD1 / Schott SF1 (717/295) |
| L6 | Positive Meniscus | HOYA E-FD1 / Schott SF1 (717/295) |