US 3,576,360 — Yoshiyuki Shimizu
| 9 elements / 7 groups |
| 35.0 mm design EFL |
| f/1.4 |
| 62° field |
| All spherical |
Patent infinity prescription with unit-extension focus approximation; production lens uses Nikon CRC.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-BAL14 class (OHARA) |
| L2 | Negative Meniscus | S-TIL1 (OHARA) |
| L3 | Biconvex Positive | S-LAH65V class (OHARA) |
| L4 | Biconcave Negative | K10 (SCHOTT catalog-equivalent; production supplier unspecified) |
| L5a | Positive Meniscus | S-LAH65V class (OHARA) |
| L5b | Biconcave Negative | SF56A (SCHOTT) |
| L6 | Positive Meniscus | S-LAH66 (OHARA) |
| L7 | Positive Meniscus | S-LAH66 (OHARA) |
| L8 | Biconvex Positive | S-LAL8 (OHARA) |