US 4,550,987, Example 1 — Satoru Tachihara
| 6 ELEMENTS / 6 GROUPS |
| DESIGN f = 200 mm |
| DESIGN F/4.0 |
| ALL SPHERICAL |
| PATENT f = 100 SCALED × 2 |
The patent prints no focus mechanism or close-focus data, so the model stays at its infinity state and no element moves. The 1.9 m minimum focus is the maker's figure. The image plane is set by the printed back focus, 65.00 mm at this scale.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | S-BSL7 (OHARA catalog equivalent; production supplier unspecified) |
| L2 | Biconcave Negative | FD140 (HOYA, coordinate equivalent) |
| L3 | Positive Meniscus | S-BSL7 (OHARA catalog equivalent; production supplier unspecified) |
| L4 | Positive Meniscus | S-BSL7 (OHARA catalog equivalent; production supplier unspecified) |
| L5 | Biconcave Negative | S-LAM2 (OHARA catalog equivalent; production supplier unspecified) |
| L6 | Biconvex Positive | S-TIM22 (OHARA catalog equivalent; production supplier unspecified) |