WO 2019/097669 A1 — Tomoki Ito
| 22 ELEMENTS / 18 GROUPS |
| f = 70–200 mm (design 71.5–196.0 mm) |
| F/2.8 (design F/2.85–2.90) |
| 6 ED + 1 FL + 1 HRI |
| ALL SPHERICAL |
Internal focus — G4 moves toward the object (¶0053); G1, G3 and G5 stay fixed and the overall length is constant. The patent's finite-distance gaps focus at 1.00 m object-to-image (calculated); the production lens focuses to 1.1 m.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | J-LASFH15 (Hikari) |
| L12 | Biconvex Positive | J-FKH1 (Hikari) |
| L13 | Positive Meniscus | CaF2 Fluorite |
| L21 | Negative Meniscus | J-LAK10 (Hikari) |
| L22 | Biconcave Negative | S-PHM52 (OHARA) / PCD4 (HOYA) |
| L23 | Positive Meniscus | J-SF03 (Hikari, nearest: patent νd 23.83 vs 23.80) |
| L24 | Biconcave Negative | J-PSK03 (Hikari) |
| L31 | Biconvex Positive | S-LAH55V (OHARA) |
| L32 | Plano-Convex Positive | J-PSKH1 (Hikari) |
| L33 | Positive Meniscus | J-FKH1 (Hikari) |
| L34 | Biconcave Negative | TAFD55 (HOYA, nearest: patent νd 29.12 vs 29.13) |
| L35 | Biconvex Positive | J-LASFH9 (Hikari) |
| L36 | Biconcave Negative | J-LF5 (Hikari) |
| L41 | Biconvex Positive | J-FKH1 (Hikari) |
| L42 | Negative Meniscus | J-LASFH15 (Hikari) |
| L43 | Positive Meniscus | J-PSKH1 (Hikari) |
| L51 | Negative Meniscus | J-LASF015 (Hikari) |
| L52 | Biconvex Positive | J-SF03 (Hikari, nearest: patent νd 23.83 vs 23.80) |
| L53 | Biconcave Negative | J-LAK10 (Hikari) |
| L54 | Plano-Concave Negative | J-LASFH21 (Hikari) |
| L55 | Biconvex Positive | J-PSKH1 (Hikari) |
| L56 | Positive Meniscus | J-LAK10 (Hikari) |