US 3,874,771 — Karl-Heinrich Behrens, Erhard 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 | LAF3 catalog equivalent (patent coordinate; production supplier unspecified) |
| L2 | Positive Meniscus | N-LAF21 catalog equivalent (historical LaF 21 family; production supplier unspecified) |
| L3 | Negative Meniscus | J-SF8 catalog equivalent (patent coordinate; production supplier unspecified) |
| L4 | Biconcave Negative | SF10 catalog equivalent (historical SF 10 family; production supplier unspecified) |
| L5 | Biconvex Positive | N-LAF21 catalog equivalent (historical LaF 21 family; production supplier unspecified) |
| L6 | Positive Meniscus | N-LAF21 catalog equivalent (historical LaF 21 family; production supplier unspecified) |
| L7 | Biconvex Positive | N-LAF2 catalog equivalent (historical LaF 2 family; production supplier unspecified) |