JP 2000-321490 A — Koji Shiokawa
| 8 ELEMENTS / 6 GROUPS |
| DESIGN f = 36.05 mm |
| DESIGN F/1.64 |
| 1 ASPHERICAL SURFACE / 1 ELEMENT |
| INFINITY PRESCRIPTION ONLY |
Infinity-only published prescription; close focus is not modeled. The production lens focuses manually with rangefinder coupling down to 0.9 m, but the patent publishes no focusing movement.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconcave Negative | 548458 — coordinate class (supplier unconfirmed) |
| L2 | Biconvex Positive | 773496 — coordinate class (supplier unconfirmed) |
| L3 | Biconvex Positive | 804465 — coordinate class (supplier unconfirmed) |
| L4 | Negative Meniscus | 648338 — coordinate class (supplier unconfirmed) |
| L5 | Biconcave Negative | 699301 — coordinate class (supplier unconfirmed) |
| L6 | Biconvex Positive | 804465 — coordinate class (supplier unconfirmed) |
| L7 | Biconvex Positive | 806407 — coordinate class (supplier unconfirmed) |
| L8 | Negative Meniscus (1× Asph) | 694533 — coordinate class (supplier unconfirmed) |