JP S55-124116 A, sole example — Eiichi Takano
| 14 ELEMENTS / 10 GROUPS |
| DESIGN f = 71.72–147.36 mm |
| DESIGN F/2.8 |
| ALL SPHERICAL |
| SOFT-FOCUS CONTROL |
The model covers infinity only. Tamron's 0.98 m minimum focus distance is catalog metadata; the patent gives no finite-focus travel. The zoom path between the three printed states is interpolated with fixed total length and paraxial image-plane constraints. The soft control moves the rear relay elements while holding the sensor fixed, without refocusing the soft image.
| Element | Type | Glass |
|---|---|---|
| Z1 | Meniscus Negative | S-TIH6 (OHARA catalog equivalent; production supplier unspecified) |
| Z2 | Biconvex Positive | BSM4 (OHARA catalog equivalent; production supplier unspecified) |
| Z3 | Meniscus Positive | BSM4 (OHARA catalog equivalent; production supplier unspecified) |
| Z4 | Plano-concave Negative | S-LAL14 (OHARA catalog equivalent; production supplier unspecified) |
| Z5 | Meniscus Positive | S-TIH6 (OHARA catalog equivalent; production supplier unspecified) |
| Z6 | Biconcave Negative | S-LAL14 (OHARA catalog equivalent; production supplier unspecified) |
| Z7 | Biconcave Negative | S-LAL14 (OHARA catalog equivalent; production supplier unspecified) |
| Z8 | Biconvex Positive | S-TIH6 (OHARA catalog equivalent; production supplier unspecified) |
| Z9 | Biconvex Positive | S-LAL8 (OHARA catalog equivalent; production supplier unspecified) |
| M10 | Biconvex Positive | S-LAL14 (OHARA catalog equivalent; production supplier unspecified) |
| M11 | Biconcave Negative | S-TIH6 (OHARA catalog equivalent; production supplier unspecified) |
| G12 | Meniscus Negative | S-TIH6 (OHARA catalog equivalent; production supplier unspecified) |
| G13 | Meniscus Negative | S-TIH6 (OHARA catalog equivalent; production supplier unspecified) |
| G14 | Biconvex Positive | TAF1 (HOYA catalog equivalent; production supplier unspecified) |