US 3,388,956 A, Example 1 — Joachim Eggert, Ernst Tronnier, Fritz Ueberhagen
| 5 ELEMENTS / 4 GROUPS |
| 200mm f/4 |
| 12.5° DIAGONAL (MARKETED) |
| DKL / BESSAMATIC |
| ALL-SPHERICAL |
The patent provides only an infinity prescription; the 8.5 m minimum focus distance from collector listings is not modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | LAK6 (Sumita; coordinate-equivalent lanthanum crown, 1964 melt vendor not stated) |
| L2 | Negative Meniscus | FDS2 (Hoya; coordinate-equivalent dense flint, 1964 melt vendor not stated) |
| L3 | Negative Meniscus | SF9 (Hikari; coordinate-equivalent dense flint, 1964 melt vendor not stated) |
| L4 | Positive Meniscus | Unmatched (758/316 dense flint; no catalog glass within 0.0001 in nd) |
| L5 | Biconcave Negative | BAFD10 (Hoya; coordinate-equivalent barium dense flint, 1964 melt vendor not stated) |