DE 1 258 134 B, Example I — Franz Schlegel
| 6 ELEMENTS / 4 GROUPS |
| DESIGN f = 100 mm |
| DESIGN F/5.6 |
| ALL SPHERICAL |
| CONVERTIBLE: FRONT CELL ≈ 276 mm |
Unit focus by view-camera bellows: the whole lens moves away from the film and only the back focus changes. The patent prints only the infinity state; the 12.69 mm extension for a 1.0 m object-to-image distance is derived paraxially and is not a manufacturer specification.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | BACD14 (HOYA catalog equivalent; production supplier unspecified) |
| L2 | Biconcave Negative | Unmatched (short flint of anomalous dispersion per the patent, ne 1.5543 / νe 49.3; no coordinate-equal catalog row) |
| L3 | Positive Meniscus | PC2 (HOYA catalog equivalent; production supplier unspecified) |
| L4 | Positive Meniscus | PC2 (HOYA catalog equivalent; production supplier unspecified) |
| L5 | Biconcave Negative | Unmatched (short flint of anomalous dispersion per the patent, ne 1.5543 / νe 49.3; no coordinate-equal catalog row) |
| L6 | Biconvex Positive | BACD14 (HOYA catalog equivalent; production supplier unspecified) |