JP 1983-137812 A — Makoto Sakano, Norikazu Arai, Shozo Ishiyama, Tadashi Kojima, Hiroshi Miyamae
| 15 ELEMENTS / 12 GROUPS |
| 70–150mm f/4 (marketed) |
| 72.164–146.388mm (published design states) |
| INNER FOCUS |
| ALL-SPHERICAL |
CONSTRAINED_RECONSTRUCTION: patent-published inner focus moves L12 (s20–s21) imageward; the 0.8 m production endpoint is code-solved with the image plane fixed and adjacent focus air-space conserved. The STO is an inferred stationary midpoint plane in the original 4.00 mm s19–s20 gap.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-TIH6 catalog-equivalent coefficient proxy (patent 805254; production supplier unspecified) |
| L2 | Positive Meniscus | S-BSM15 catalog-equivalent coefficient proxy (patent 623582; production supplier unspecified) |
| L3 | Biconvex Positive | S-BSM15 catalog-equivalent coefficient proxy (patent 623582; production supplier unspecified) |
| L4 | Positive Meniscus | S-TIH6 catalog-equivalent coefficient proxy (patent 805254; production supplier unspecified) |
| L5 | Biconcave Negative | J-LAK14 catalog-equivalent coefficient proxy (patent 697555; production supplier unspecified) |
| L6 | Biconcave Negative | J-LAK14 catalog-equivalent coefficient proxy (patent 697555; production supplier unspecified) |
| L7 | Positive Meniscus | S-TIH6 catalog-equivalent coefficient proxy (patent 805254; production supplier unspecified) |
| L8 | Biconvex Positive | S-BSM15 catalog-equivalent coefficient proxy (patent 623582; production supplier unspecified) |
| L9 | Negative Meniscus | S-TIH6 catalog-equivalent coefficient proxy (patent 805254; production supplier unspecified) |
| L10 | Positive Meniscus | NSL7 catalog-equivalent coefficient proxy (patent 511605; production supplier unspecified) |
| L11 | Positive Meniscus | NSL7 catalog-equivalent coefficient proxy (patent 511605; production supplier unspecified) |
| L12 | Plano-Concave Negative | SF1 catalog-equivalent coefficient proxy (patent 717295; production supplier unspecified) |
| L13 | Biconvex Positive | S-TIL26 catalog-equivalent coefficient proxy (patent 567428; production supplier unspecified) |
| L14 | Biconcave Negative | J-LASF016 catalog-equivalent coefficient proxy (patent 773496; production supplier unspecified) |
| L15 | Biconvex Positive | E-F8 catalog-equivalent coefficient proxy (patent 596392; production supplier unspecified) |