JP 2001-124985 A — Yoshihisa Yomogida
| 10 ELEMENTS / 8 GROUPS |
| DESIGN f = 11.98 mm |
| DESIGN F/5.66 |
| 2ω = 121° |
| 1 ASPHERICAL SURFACE / 1 ELEMENT |
| INFINITY PRESCRIPTION ONLY |
Infinity only. The patent tabulates one prescription and no finite-focus spacings, so close focus is not modeled and every air gap stays fixed. The production lens is scale-focused by hand to 0.3 m with no rangefinder coupling; how its optics move is not published.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | 773496 — coordinate class (supplier unconfirmed) |
| L12 | Negative Meniscus | 773496 — coordinate class (supplier unconfirmed) |
| L13 | Biconvex Positive | 805255 — coordinate class (supplier unconfirmed) |
| L21 | Negative Meniscus | 847238 — coordinate class (supplier unconfirmed) |
| L22 | Biconvex Positive | 517642 — coordinate class (supplier unconfirmed) |
| L23 | Biconvex Positive | 487704 — coordinate class (supplier unconfirmed) |
| L31 | Positive Meniscus | 834373 — coordinate class (supplier unconfirmed) |
| L32 | Negative Meniscus | 717295 — coordinate class (supplier unconfirmed) |
| L41 | Biconcave Negative | 620363 — coordinate class (supplier unconfirmed) |
| L42 | Biconvex Positive (1× Asph) | 589613 — coordinate class (supplier unconfirmed) |