US 2019/0018229 A1 — Naoki Miyagawa, Yonghua Chen
| 23 ELEMENTS / 18 GROUPS |
| f = 72.1–194.0 mm |
| F/2.88 |
| 2ω = 34.3°–12.3° |
| 4 ASPHERICAL SURFACES (3 ELEMENTS) |
Dual floating internal focus in the patent: G1R moves toward the object and G5 moves toward the image plane from infinity to close focus. Close-focus spacings are not tabulated in the patent, so this data file models the published infinity-focus zoom positions only.
| Element | Type | Glass |
|---|---|---|
| L1F1 | Negative Meniscus | TAF3D / S-LAH65VS class (HOYA/OHARA, 804/465) |
| L1F2 | Biconvex Positive | FCD100 (HOYA, 437/951 Super ED) |
| L1F3 | Positive Meniscus | FCD100 (HOYA, 437/951 Super ED) |
| L1R1 | Negative Meniscus | E-FD1L (HOYA, 717/295) |
| L1R2 | Positive Meniscus | FCD515 (HOYA, 593/686 ED) |
| L21 | Biconcave Negative | TAF3D / S-LAH65VS class (HOYA/OHARA, 804/465) |
| L22 | Biconcave Negative | FCD515 (HOYA, 593/686 ED) |
| L23 | Biconvex Positive | FD225 (HOYA, 808/228) |
| L24 | Negative Meniscus | TAF3D / S-LAH65VS class (HOYA/OHARA, 804/465) |
| L31 | Biconvex Positive | NBF1 / S-LAM60 class (HOYA/OHARA, 743/492) |
| L32 | Biconvex Positive | FCD1 / S-FPL51 class (HOYA/OHARA, 497/816 ED) |
| L33 | Negative Meniscus | NBFD15 (HOYA, 806/333) |
| L41 | Pos. Meniscus (1× Asph) | M-BACD12 (HOYA, 583/595; glass for molding) |
| L42 | Positive Meniscus | FCD1 / S-FPL51 class (HOYA/OHARA, 497/816 ED) |
| L43 | Negative Meniscus | TAFD55 / TAFD55-W (HOYA, 001/291) |
| L44 | Biconvex Positive | E-FL6 (HOYA, 567/428) |
| L51 | Biconcave Negative (2× Asph) | M-BACD12 (HOYA, 583/595; glass for molding) |
| L61 | Biconvex Positive (1× Asph) | L-BSL7 (OHARA, 516/641; low-softening glass for molding) |
| L62 | Negative Meniscus | J-LASFH6 (HIKARI, 806/333) |
| L63 | Biconvex Positive | E-FD5 (HOYA, 673/322) |
| L64 | Negative Meniscus | TAFD5G / S-LAH55VS class (HOYA/OHARA, 835/427) |
| L65 | Biconcave Negative | TAC8 / S-LAL18 class (HOYA/OHARA, 729/547) |
| L66 | Negative Meniscus | TAFD30 (HOYA, 883/408) |
SONY 1.4x TELECONVERTER SEL14TC, SONY 2x TELECONVERTER SEL20TC