DE 28 18 394 B1 — Josef Weiß, Franz Schlegel
| 3 elements / 3 groups |
| f' = 210.10 mm (d-line) |
| f/6.8 |
| 2ω ≥ 56° patent field |
| all-spherical |
Whole-lens unit focus by view-camera rail/bellows; close-focus slider endpoint is illustrative, not lens-limited.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | N-SK16 / SK16 (Schott) |
| L2 | Biconcave Negative | LLF1 (Schott) |
| L3 | Biconvex Positive | N-BK7 / BK7 (Schott) |