US 2,573,511 A — Albrecht Wilhelm Tronnier
| 4 ELEMENTS / 3 GROUPS |
| f = 104.999mm |
| F/3.5 |
| 2ω ≈ 51.35° |
| ALL-SPHERICAL |
Production camera focusing is documented to approximately 1.0m, but US 2,573,511 A publishes only the infinity prescription; no focus gaps are modeled (NO_INTERNAL_RECONSTRUCTION).
| Element | Type | Glass |
|---|---|---|
| L1 | Plano-Convex Positive | N-SK16 (Schott catalog equivalent; production supplier unspecified) |
| L2 | Biconcave Negative | J-LF5 (Hikari catalog equivalent; production supplier unspecified) |
| L3 | Negative Meniscus | J-LF5 (Hikari catalog equivalent; production supplier unspecified) |
| L4 | Biconvex Positive | J-SSK5 (Hikari catalog equivalent; production supplier unspecified) |