US 3,915,558 — Erhard Glatzel
| 9 ELEMENTS / 8 GROUPS |
| f ≈ 36.5 mm |
| F/1.4 |
| 2ω ≈ 62° |
| 1 ASPHERICAL SURFACE |
Unit focus approximation. Production lens uses floating element focusing to 0.3 m MFD.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | BAF3 (HIKARI) |
| L2 | Negative Meniscus | LLF1 (Schott) |
| L3a | Biconvex Positive | N-LaK8 (Schott) |
| L3b | Positive Meniscus | N-LaK8 (Schott) |
| L4 | Positive Meniscus | N-LaK8 (Schott) |
| L5 | Biconcave Negative (1× Asph) | LLF1 (Schott) |
| L6 | Biconcave Negative | SF57 (Schott) |
| L7 | Biconvex Positive | N-LaF21 (Schott) |
| L8 | Biconvex Positive | N-LaF21 (Schott) |