US 3,502,393, sole example — Tomokazu Kazamaki, Tohru Matsumoto
| 6 ELEMENTS / 5 GROUPS |
| DESIGN f = 100 (NORMALIZED; SCALED 6× TO 600 mm) |
| DESIGN F/4 |
| ALL SPHERICAL |
The model stays at infinity focus because the patent prints no close-focus spacings and names no focusing group; the production lens focuses to 12 m.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | S-BSL7 (OHARA catalog equivalent; production supplier unspecified) |
| L2 | Biconcave Negative | S-TIH14 (OHARA catalog equivalent; production supplier unspecified) |
| L3 | Positive Meniscus | Unmatched (512598 crown; no public catalog row) |
| L4 | Biconvex Positive | LLF8 (SUMITA catalog equivalent; production supplier unspecified) |
| L5 | Positive Meniscus | FF5 (HOYA; coordinate proxy; production supplier unspecified) |
| L6 | Negative Meniscus | S-LAL52 (OHARA catalog equivalent; production supplier unspecified) |