US 4,497,547 Example 1 — Kiyoshi Hayashi / Nippon Kogaku
| 16 elements / 13 groups |
| 51.35-131.5 mm design EFL |
| f/3.5 constant aperture |
| 47.26°-18.06° patent field |
| All-spherical Yamaji-type zoom |
Front-group unit focus in production and patent text; patent close-focus spacings are not published, so this file models only the infinity-focus zoom states.
| Element | Type | Glass |
|---|---|---|
| 1L1 | Negative Meniscus | S-TIH6 (OHARA; 805254) |
| 1L2 | Positive Meniscus | S-LAL12 class (OHARA; 678553, patent vd rounded to 55.6) |
| 1L3 | Positive Meniscus | S-BAH11 (OHARA; 667483) |
| 2L1 | Plano-Concave Negative | S-LAL14 class (OHARA; 697555, patent vd rounded to 55.6) |
| 2L2 | Biconcave Negative | S-LAH64 class (OHARA; 788474) |
| 2L3 | Positive Meniscus | S-TIH6 (OHARA; 805254) |
| 3L1 | Biconcave Negative | Unmatched (670576 lanthanum-crown code; no confirmed current catalog) |
| 3L2 | Biconvex Positive | Unmatched / S-NBH-class (672389 short-flint code) |
| 4L1 | Biconvex Positive | S-LAL8 class (OHARA; 713539, patent vd rounded to 54.0) |
| 4L2 | Positive Meniscus | N-SK11 / BACD11 class (564608 dense-crown code) |
| 4L3 | Negative Meniscus | Unmatched / S-LAH52-class (796410 lanthanum-flint code) |
| 4L4 | Biconvex Positive | S-NSL3 (OHARA; 518590) |
| 4L5 | Biconcave Negative | J-LAFH3 (HIKARI; 795286) |
| 4L6 | Biconvex Positive | S-BSL7 / N-BK7 class (517641 borosilicate-crown code) |
| 4L7 | Negative Meniscus | N-BAF10 class (670471 barium-flint code) |
| 4L8 | Plano-Convex Positive | S-BAH27 class (OHARA; 702412, patent vd rounded to 41.0) |
Detailed analysis available in the interactive viewer above.