GB 2 066 504 A — Eberhard Dietzsch, Heinz-Dietrich Siegert, Erich Greiner
| 7 ELEMENTS / 6 GROUPS |
| f = 49.995 mm (design) |
| f/1.4 |
| 46° PATENT FULL FIELD |
| ALL-SPHERICAL |
Infinity prescription only; the patent gives no focus travel. The production lens focuses to 0.36 m.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | K-LaK12 (coordinate-compatible dispersion proxy; historical supplier unconfirmed) |
| L2 | Positive Meniscus | LAFN2 (coordinate-compatible dispersion proxy; historical supplier unconfirmed) |
| L3 | Negative Meniscus | S-TIH3 (coordinate-compatible dispersion proxy; historical supplier unconfirmed) |
| L4a | Negative Meniscus | S-TIH4 (coordinate-compatible dispersion proxy; historical supplier unconfirmed) |
| L4b | Positive Meniscus | N-LAF34 (coordinate-compatible dispersion proxy; historical supplier unconfirmed) |
| L5 | Positive Meniscus | N-LAF34 (coordinate-compatible dispersion proxy; historical supplier unconfirmed) |
| L6 | Biconvex Positive | N-LAF34 (coordinate-compatible dispersion proxy; historical supplier unconfirmed) |