US 2,645,156 A — Albrecht Wilhelm Tronnier
| 5 ELEMENTS / 3 GROUPS |
| f = 104.999 mm (MODELED) |
| f/3.5 |
| 6×9 FORMAT |
| ALL-SPHERICAL |
NO_INTERNAL_RECONSTRUCTION: patent gives infinity only; 1.0 m close-focus metadata is not modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | N-LAK7 (Schott catalog equivalent; production supplier unspecified) |
| L2 | Biconcave Negative | 603384 — flint class (legacy F5-family coordinates; vendor unresolved) |
| L3 | Biconcave Negative | 643479 — barium-flint class (legacy BAF9-family coordinates; vendor unresolved) |
| L4 | Plano-Concave Negative | LF5 (Schott catalog equivalent; production supplier unspecified) |
| L5 | Biconvex Positive | S-LAL13 (Ohara catalog equivalent; production supplier unspecified) |