JP 2020-020948 A — Noriyuki Ogasawara
| 25 ELEMENTS / 19 GROUPS |
| DESIGN f = 62.03–577.73 mm |
| DESIGN F/4.48–6.50 |
| ALL SPHERICAL |
PUBLISHED: rear focus. G6 (L22–L25) moves toward the image as the object approaches, widening gap d38 by 0.44 mm at the wide end, 2.39 mm at 183.64 mm and 15.90 mm at the tele end between infinity and 2.6 m. The patent tabulates infinity, 13 m and 2.6 m at all three zoom stations; the distances are taken as object-to-image, which the numbers support but the patent does not state. States in between are interpolated. The marketed 0.6 m minimum focus at the wide end is closer than the patent's nearest state and is not modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | TAFD32 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L2 | Positive Meniscus | FCD1 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L3 | Plano-Convex | FCD100 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L4 | Biconvex Positive | FD60-W (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L5 | Biconcave Negative | TAFD32 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L6 | Negative Meniscus | TAFD32 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L7 | Biconvex Positive | E-F5 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L8 | Positive Meniscus | E-CF6 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L9 | Biconcave Negative | S-LAM54 (OHARA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L10 | Biconcave Negative | PCD40 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L11 | Biconvex Positive | S-NBH56 (OHARA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L12 | Biconvex Positive | NBFD15-W (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L13 | Biconvex Positive | PCD51 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L14 | Biconcave Negative | FDS90-SG (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L15 | Positive Meniscus | BACD5 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L16 | Negative Meniscus | TAFD45L (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L17 | Biconvex Positive | FCD100 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L18 | Negative Meniscus | TAFD35L (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L19 | Negative Meniscus | TAFD32 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L20 | Biconvex Positive | BAC4 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L21 | Biconvex Positive | BACD16 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L22 | Positive Meniscus | S-NBH52 (OHARA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L23 | Biconcave Negative | FCD100 (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L24 | Biconcave Negative | TAFD45L (HOYA coordinate-compatible catalog equivalent; supplier unconfirmed) |
| L25 | Biconvex Positive | S-NBH56 (OHARA coordinate-compatible catalog equivalent; supplier unconfirmed) |