JP WO2020/105107 A1 Example 1 — Nikon Corporation
| Production: 50-250 mm, f/4.5-6.3 |
| Patent Example 1: f = 51.50-242.80 mm |
| 16 elements / 12 groups |
| 1 ED element; all-spherical prescription |
| GN1 optical VR; GN2 internal focus |
Internal focus by image-side movement of GN2 (L41/L42). Close-focus spacings are paraxial estimates from Nikon's published MFDs; the patent table gives infinity spacings only.
| Element | Type | Glass |
|---|---|---|
| L11 | Positive Meniscus | N-BK7 / S-BSL7 / J-BK7A class |
| L12 | Negative Meniscus | F5 (Schott) / S-TIM5 / J-F5 class |
| L13 | Positive Meniscus | J-FK5 (Hikari) |
| L21 | Negative Meniscus | E-LASF016 (Hikari) / J-LASF016 class |
| L22 | Biconcave Negative | H-ZLAF52A (CDGM) / J-LASF03 class |
| L23 | Biconvex Positive | Dense flint class 946180 (HOYA FDS18/FDS18-W equivalent, vendor unspecified) |
| L31 | Biconvex Positive | J-FK01A (Hikari, ED fluorophosphate) |
| L32 | Negative Meniscus | J-LASF021 (Hikari) |
| L33 | Positive Meniscus | E-C3 (HOYA) / S-NSL3 / J-K3 class |
| L34 | Negative Meniscus | 902253 — high-index dense flint (J-LASFH24 class; no exact public catalog match) |
| L35 | Biconvex Positive | S-LAM2 (OHARA) / J-LAF2 class |
| L36 | Positive Meniscus | J-LASF017 (Hikari) |
| L41 | Biconvex Positive | H-ZF7LA (CDGM) / S-TIH6 / J-SF6 class |
| L42 | Biconcave Negative | H-ZLAF52A (CDGM) / J-LASF03 class |
| L51 | Positive Meniscus | N-SK5 / S-BAL35 / J-SK5 class |
| L52 | Negative Meniscus | High-index lanthanum-flint class 911353 (CDGM H-ZLaF4LA / HOYA TAFD35L equivalent, vendor unspecified) |
Detailed analysis available in the interactive viewer above.