US 4,029,397 — Nobuo Yamashita
| 11 ELEMENTS / 9 GROUPS |
| 18.03 mm PARAXIAL EFL |
| f/3.5 |
| 100° DIAGONAL FIELD |
| FLOATING REAR GROUP |
| ALL SPHERICAL |
Floating rear group: L3-L11 advances toward the fixed L1-L2 front group; the final BFD increases by the same amount.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | S-LAL12 (OHARA; coordinate match) |
| L2 | Negative Meniscus | S-LAH51 (OHARA; coordinate match) |
| L3 | Negative Meniscus | S-LAH51 (OHARA; coordinate match) |
| L4 | Negative Meniscus | S-LAH51 (OHARA; coordinate match) |
| L5 | Biconvex Positive | S-TIL26 (OHARA; coordinate match) |
| L6 | Negative Meniscus | S-LAL14 (OHARA; coordinate match) |
| L7 | Biconvex Positive | S-FTM16 class (OHARA; closest current coordinate match) |
| L8 | Positive Meniscus | S-LAH51 (OHARA; coordinate match) |
| L9 | Biconcave Negative | SF57 (SCHOTT; coordinate match) |
| L10 | Positive Meniscus | S-PHM52 (OHARA; coordinate match) |
| L11 | Positive Meniscus | S-PHM52 (OHARA; coordinate match) |