JP 2025-043459 A — Masakazu Hibino
| 20 ELEMENTS / 15 GROUPS |
| DESIGN f = 72.10–194.00 mm |
| DESIGN F/2.91 |
| 4 ASPHERICAL SURFACES / 3 ELEMENTS |
PUBLISHED: the patent tabulates infinity and a 1.0 m object-to-image distance at all three zoom stations. For close focus G6 moves toward the image by 1.32, 3.57 and 7.84 mm at 72.1, 118 and 194 mm, and G7 toward the object by 1.22, 2.77 and 7.42 mm. Positions between the printed states interpolate the printed gaps linearly and are not the production focus cam. The marketed 0.65 m minimum focus at the wide end is not in the patent and is not modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | NBFD11 (HOYA; equals the patent nd and PgF, catalog νd 43.93; supplier unconfirmed) |
| L2 | Biconvex Positive | FCD100 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L3 | Biconvex Positive | FCD100 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L4 | Negative Meniscus | FCD100 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L5 | Biconcave Negative | FCD705 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L6 | Positive Meniscus | NBFD30 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L7 | Positive Meniscus | TAFD32 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L8 | Positive Meniscus (1× Asph) | M-NBFD130 (HOYA moulding glass; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L9 | Negative Meniscus | NBFD15 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L10 | Positive Meniscus | FCD100 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L11 | Positive Meniscus | S-NPH1 (OHARA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L12 | Biconcave Negative (1× Asph) | M-LAC130 (HOYA moulding glass; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L13 | Biconvex Positive | FCD100 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L14 | Negative Meniscus | NBFD25 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L15 | Biconvex Positive (2× Asph) | L-LAH91 (OHARA low-Tg moulding glass; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L16 | Positive Meniscus | FDS20-W (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L17 | Negative Meniscus | TAC6 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L18 | Biconvex Positive | S-LAL54Q (OHARA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L19 | Biconcave Negative | FCD100 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |
| L20 | Negative Meniscus | FCD1 (HOYA; equals the patent nd, νd and PgF; supplier unconfirmed) |