US 2019/0353880 A1 — Example 1 / Nikon Machida
| 18 elements / 14 groups |
| Patent design f=72.10-292.01 mm |
| Marketed 70-300 mm f/4.5-5.6 |
| One ED element in Nikon production specification |
| Rear internal focus; optical VR group |
| All-spherical prescription |
Rear internal focus: the negative G4/RN group (L41-L42) translates imageward. Patent short-distance travel is 0.657 mm at wide, 0.820 mm at middle, and 1.719 mm at telephoto; Nikon's production MFD is 1.2 m.
| Element | Type | Glass |
|---|---|---|
| L11 | Plano-Convex Positive | J-FK5 (Hikari) |
| L12 | Negative Meniscus | F2 (Schott) / J-F2 class (Hikari) |
| L13 | Positive Meniscus | J-FK01A (Hikari, ED fluorophosphate candidate) |
| L21 | Negative Meniscus | S-LAL14 (OHARA) / J-LAK14 class (Hikari) |
| L22 | Biconvex Positive | SF11 (Schott) / J-SF11 class (Hikari; patent vd=25.64) |
| L23 | Biconcave Negative | N-LAF34 (Schott) / S-LAH66 / J-LASF016 class |
| L24 | Negative Meniscus | J-LASF021 (Hikari) |
| L31 | Negative Meniscus | J-LAF016 (Hikari) |
| L32 | Biconvex Positive | S-BSM81 (OHARA) / J-LAK01 class (patent vd=60.20) |
| L33 | Biconvex Positive | J-FK5 (Hikari) |
| L34 | Biconcave Negative | H-ZLAF52A (CDGM) / J-LASF03 class |
| L35 | Negative Meniscus | S-LAH60 (OHARA) / J-LASF010 class |
| L36 | Biconvex Positive | J-BK7A / BK7-family class (Hikari) |
| L37 | Biconvex Positive | J-LAF016 (Hikari) |
| L41 | Positive Meniscus | H-ZF7LA (CDGM) / S-TIH6 / J-SF6 class |
| L42 | Biconcave Negative | N-LAF34 (Schott) / S-LAH66 / J-LASF016 class |
| L51 | Negative Meniscus | F2 (Schott) / J-F2 class (Hikari) |
| L52 | Biconvex Positive | N-BAF10 (Schott) / J-BAF10 class |
Detailed analysis available in the interactive viewer above.