US 3,874,771 EXAMPLE 5 — CARL ZEISS / BEHRENS & GLATZEL
| 7 ELEMENTS / 6 GROUPS |
| f ≈ 50.0 mm |
| F/1.4 |
| 2ω ≈ 46.8° |
| ALL SPHERICAL |
Unit focusing — entire optical assembly moves forward. C/Y mount MFD 0.45 m.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | LaK 21 (SCHOTT) |
| L2 | Positive Meniscus | LaF 21 (SCHOTT) |
| L3 | Negative Meniscus | SF 56 (SCHOTT) |
| L4 | Biconcave Negative | SF 10 family (SCHOTT) |
| L5 | Biconvex Positive | LaF 21 (SCHOTT) |
| L6 | Positive Meniscus | LaF 21 (SCHOTT) |
| L7 | Biconvex Positive | LaF 2 (SCHOTT) |
Detailed analysis available in the interactive viewer above.