JP 2018-017857 A — Tetsushi Miwa, Hiroshi Yabumoto
| 19 elements / 11 groups |
| 500 mm f/5.6 marketed |
| f = 489.704 mm design |
| F/5.750 design |
| 3 ED + 1 PF element |
| Published internal focus + VR grouping |
Published G2-dominant internal focus; D1, D2, and BF vary from infinity to 3.0 m
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive Low-Dispersion | J-FK5 (Hikari) |
| L12 | Biconvex Positive Low-Dispersion | J-FK5 (Hikari) |
| L13 | Biconcave Negative | J-KZFH1 (Hikari) |
| L14 | Positive Meniscus PF Substrate | J-BK7A class (Hikari) |
| GDa | Thin Bonded Diffractive Material | Unmatched (bonded PF material A; patent nd=1.52780, vd=33.41) |
| GDb | Thin Bonded Phase Layer | Unmatched (bonded PF material B; patent nd=1.55710, vd=49.74) |
| L15 | Negative Meniscus | J-LASF08A class (Hikari) |
| L16 | Positive Meniscus Low-Dispersion | J-FK5 (Hikari) |
| L21 | Biconvex Positive | J-SF2 (Hikari) |
| L22 | Biconcave Negative | J-LAK10 (Hikari) |
| L31 | Biconcave Negative | J-LASF09A (Hikari) |
| L32 | Biconvex Positive | J-K3 (Hikari) |
| L33 | Biconvex Positive | J-F2 (Hikari) |
| L34 | Biconcave Negative ED | J-FKH1 (Hikari) |
| L35 | Biconcave Negative ED | J-PSKH1 (Hikari) |
| L36 | Biconvex Positive | J-LF7 (Hikari) |
| L37 | Negative Meniscus ED | J-FKH1 (Hikari) |
| L38 | Biconcave Negative | J-LASF09A (Hikari) |
| L39 | Biconvex Positive | J-KZFH1 (Hikari) |
| L310 | Biconvex Positive | J-LF5 (Hikari) |
| L311 | Negative Meniscus | J-SFH1 (Hikari) |