US 3,994,576, Example 7 — Erhard Glatzel, Heinz Zajadatz
| 5 ELEMENTS / 4 GROUPS |
| DESIGN f = 40.00 mm |
| DESIGN F/2.90 |
| ALL SPHERICAL |
Manual focus to 0.9 m on the camera. The patent prints the infinity state only, so no close-focus spacing is modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | LAF3 (HOYA; Schott LaF3 equivalent) |
| L2 | Positive Meniscus | LAF3 (HOYA; Schott LaF3 equivalent) |
| L3 | Negative Meniscus | SF11 (Schott) |
| L4 | Negative Meniscus | S-BSM18 (OHARA; Schott SK18 coordinate equivalent) |
| L5 | Biconvex Positive | S-LAM2 (OHARA; Schott LaF2 coordinate equivalent) |