US 2,724,994 — Günther Lange
| 5 ELEMENTS / 4 GROUPS |
| f ≈ 80.00 mm (modeled) |
| F/2.8 (stop calibrated) |
| 6×6 |
| ALL-SPHERICAL |
Infinity prescription only. The Rolleiflex moves the complete lens panel for focus; travel is not modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | E-FD15 (coordinate-compatible dispersion proxy; historical supplier unconfirmed) |
| L2 | Positive Meniscus | S-LAL13 (coordinate-compatible dispersion proxy; historical supplier unconfirmed) |
| L3 | Negative Meniscus | E-FD15 (coordinate-compatible dispersion proxy; historical supplier unconfirmed) |
| L4 | Negative Meniscus | J-SF14 (coordinate-compatible dispersion proxy; historical supplier unconfirmed) |
| L5 | Positive Meniscus | J-SK16 (coordinate-compatible dispersion proxy; historical supplier unconfirmed) |