US 4,303,312 A, sole example — Heinrich Basista
| 15 ELEMENTS / 12 GROUPS |
| DESIGN f = 72.15–203.20 mm |
| DESIGN F/3.5 |
| ALL SPHERICAL |
The maker describes front-element focusing to 1.8 m, but does not identify whether the front cemented doublet or the complete front group moves, its direction or its travel. The model covers zooming at infinity only; optical spacings remain unchanged with the focus control. The separate macro setting reaches 0.3 m from the film plane and is not modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | SF6 (SCHOTT catalog equivalent; production supplier unspecified) |
| L2 | Positive Meniscus | N-BK7 (SCHOTT catalog equivalent; production supplier unspecified) |
| L3 | Biconvex Positive | N-KF9 (SCHOTT catalog equivalent; printed nd/νd equal legacy Schott KF9; production supplier unspecified) |
| L4 | Biconcave Negative | N-LAK9 (SCHOTT catalog equivalent; production supplier unspecified) |
| L5 | Biconcave Negative | N-LAK9 (SCHOTT catalog equivalent; production supplier unspecified) |
| L6 | Biconvex Positive | SF5 (SCHOTT catalog equivalent; production supplier unspecified) |
| L7 | Biconcave Negative | N-LAK9 (SCHOTT catalog equivalent; production supplier unspecified) |
| L8 | Positive Meniscus | E-FD8 (HOYA catalog equivalent; printed nd/νd equal legacy Schott SF8; production supplier unspecified) |
| L9 | Biconvex Positive | BACD4 (HOYA catalog equivalent; printed nd/νd equal legacy Schott SK4; production supplier unspecified) |
| L10 | Biconvex Positive | N-PSK3 (SCHOTT catalog equivalent; production supplier unspecified) |
| L11 | Biconvex Positive | N-FK5 (SCHOTT catalog equivalent; production supplier unspecified) |
| L12 | Biconcave Negative | SF6 (SCHOTT catalog equivalent; production supplier unspecified) |
| L13 | Negative Meniscus | LLF1 (SCHOTT catalog equivalent; production supplier unspecified) |
| L14 | Biconvex Positive | LLF1 (SCHOTT catalog equivalent; production supplier unspecified) |
| L15 | Negative Meniscus | K-SSK4 (SUMITA catalog equivalent; printed nd/νd equal legacy Schott SSK4; production supplier unspecified) |