| 5 ELEMENTS / 4 GROUPS |
| DESIGN f = 50.0 mm |
| PATENT f/2.9 / MARKETED f/2.8 |
Only the fixed patent prescription is modeled; the closest-focus distance is secondary Exakta-variant metadata and is not used to infer focus motion.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | 589612-class crown (supplier/melt unresolved) |
| L2 | Positive Meniscus | S-BSM18 — compatible spectral proxy (historical supplier/melt unresolved) |
| L3 | Biconcave Negative | F5 — compatible spectral proxy (historical supplier/melt unresolved) |
| L4 | Biconcave Negative | KF3 — compatible spectral proxy (historical supplier/melt unresolved) |
| L5 | Biconvex Positive | N-SK14 — compatible spectral proxy (historical supplier/melt unresolved) |