JP 2015-215559 A — Kazumasa Tanaka, Toshinori Take, Tetsushi Miwa
| 16 ELEMENTS / 12 GROUPS |
| 2 FLUORITE + 2 ED |
| 400 mm MARKETED / 391.497 mm MODELED |
| f/2.8 MARKETED / f/2.8815 MODELED |
| FX / 6°10′ MARKETED |
| INNER FOCUS + VR |
PUBLISHED: G2 moves 15.400 mm imageward from infinity to the patent close-focus state (β = −0.173). The source also increases Bf by 0.024 mm; after omitting FLG and rear FL this is preserved as a 0.024 mm rear-spacing adjustment, not a second moving lens group. The normalized active close state paraxially images at 2.59018 m; no internal focus travel is reconstructed.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive | Fluorite (CaF2; Malitson 1963 spectral model) |
| L12 | Biconvex Positive | Fluorite (CaF2; Malitson 1963 spectral model) |
| L13 | Biconcave Negative | J-KZFH1 (HIKARI) |
| L14 | Negative Meniscus | J-LASF017 (HIKARI) |
| L15 | Positive Meniscus | J-FKH1 (HIKARI) |
| L21 | Biconcave Negative | J-LASF016 (HIKARI) |
| L22 | Positive Meniscus, concave to object | J-SF03 (HIKARI) |
| L23 | Biconcave Negative | J-K3 (HIKARI) |
| L31 | Biconvex Positive | J-FK5 (HIKARI) |
| L32 | Negative Meniscus, concave to object | J-SF03 (HIKARI) |
| L33 | Biconvex Positive | J-SF03 (HIKARI) |
| L34 | Biconcave Negative | J-PSKH1 (HIKARI) |
| L35 | Biconcave Negative | J-LASKH2 (HIKARI) |
| L36 | Biconvex Positive | J-LASF016 (HIKARI) |
| L37 | Biconvex Positive | J-LAK01 (HIKARI) |
| L38 | Biconcave Negative | J-SF03 (HIKARI) |