US 3,560,079 — Zenji Wakimoto, Yoshiyuki Shimizu
| 7 ELEMENTS / 5 GROUPS |
| f ≈ 50.0 mm |
| F/1.4 |
| 2ω ≈ 46° |
| ALL SPHERICAL |
Unit focus — entire optical assembly translates along the optical axis. 7-blade aperture diaphragm.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | J-BASF2 (Hikari) |
| L2 | Positive Meniscus | S-LAL13 (OHARA) |
| L3 | Negative Meniscus | E-FD2 (HOYA) |
| L4 | Negative Meniscus | S-TIM35 (OHARA) |
| L5 | Positive Meniscus | S-LAL8 (OHARA) |
| L6 | Positive Meniscus | LAC12 (HOYA) |
| L7 | Biconvex Positive | S-LAL8 (OHARA) |