US 3,057,257 — Günter Klemt, Karl Macher
| 13 ELEMENTS / 9 GROUPS |
| 10-40mm |
| f/2.8 |
| NORMAL-8 CORRELATION |
| ALL SPHERICAL |
Front-group focusing is source-documented; no finite-focus internal spacing is reconstructed.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | PC3 — coordinate-compatible spectral proxy (supplier unresolved) |
| L2 | Biconvex Positive | S-BSM16 — coordinate-compatible spectral proxy (supplier unresolved) |
| L3 | Biconcave Negative | S-TIH14 — coordinate-compatible spectral proxy (supplier unresolved) |
| L4 | Positive Meniscus | E-FD4 — coordinate-compatible spectral proxy (supplier unresolved) |
| L5 | Biconcave Negative | PC1 — coordinate-compatible spectral proxy (supplier unresolved) |
| L6 | Biconcave Negative | PC1 — coordinate-compatible spectral proxy (supplier unresolved) |
| L7 | Positive Meniscus | E-FD4 — coordinate-compatible spectral proxy (supplier unresolved) |
| L8 | Biconvex Positive | S-BSM16 — coordinate-compatible spectral proxy (supplier unresolved) |
| L9 | Negative Meniscus | F2 — coordinate-compatible spectral proxy (supplier unresolved) |
| L10 | Biconvex Positive | S-BSM16 — coordinate-compatible spectral proxy (supplier unresolved) |
| L11 | Positive Meniscus | S-BSM16 — coordinate-compatible spectral proxy (supplier unresolved) |
| L12 | Biconcave Negative | E-FD15 — coordinate-compatible spectral proxy (supplier unresolved) |
| L13 | Biconvex Positive | K-LaK11 — coordinate-compatible spectral proxy (supplier unresolved) |