US 4,158,482, Example 1 — Yoshikazu Doi, Yutaka Sakai
| 9 ELEMENTS / 8 GROUPS |
| f ≈ 24.003 mm |
| F/2.8 |
| 2ω = 84° |
| ALL-SPHERICAL |
NO_INTERNAL_RECONSTRUCTION: infinity prescription only; manufacturer MFD is 0.25 m, but patent focus kinematics are unpublished.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-BSM10 (623569 crown coordinate; catalog equivalent, vendor undetermined) |
| L2 | Biconvex Positive | 518590 crown coordinate class; vendor undetermined |
| L3 | Negative Meniscus | 623581/582 crown coordinate class; vendor undetermined |
| L4 | Plano-Concave Negative | BAF22 (683445 barium-flint coordinate; catalog equivalent, vendor undetermined) |
| L5 | Biconvex Positive | 699301 dense-flint coordinate class; vendor undetermined |
| L6 | Biconvex Positive | J-LAK01 (640602 lanthanum-crown coordinate; catalog equivalent, vendor undetermined) |
| L7 | Biconcave Negative | 762265/266 dense-flint coordinate class; vendor undetermined |
| L8 | Positive Meniscus (convex to rear) | 620603 crown coordinate class; vendor undetermined |
| L9 | Near-Plano-Convex Positive | 622531-533 dense-crown coordinate class; vendor undetermined |