JP 2012-181525 A — Nobuyuki Adachi, Hisayuki Yamanaka
| 17 ELEMENTS / 13 GROUPS |
| 18.50-194.00 mm PATENT EFL |
| f/3.56-6.47 PATENT |
| 5 ASPHERICAL SURFACES |
| INNER FOCUS / VC |
Patent inner focus uses the single positive F element as the focusing group. Focus status NO_INTERNAL_RECONSTRUCTION: only the three published infinity zoom states are modeled; 0.5 m is the marketed MOD, not a reconstructed close-focus state.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | 904313 - lanthanum-flint class |
| L2 | Biconvex Positive | K-CaFK95 (Sumita catalog equivalent; production supplier unspecified) |
| L3 | Positive Meniscus | 729547 - lanthanum-crown class |
| L4r | Hybrid Resin Layer (1x Asph) | Unmatched (hybrid asphere resin/polymer, nd=1.51460, vd=50.0) |
| L4g | Negative Meniscus | 883408 - high-index lanthanum-flint class |
| L5 | Biconcave Negative | 804465 - lanthanum-flint class |
| L6 | Biconvex Positive | 923209 - dense-flint class |
| L7 | Negative Meniscus (1x Asph) | M-TAF31 (Hoya catalog equivalent; production supplier unspecified) |
| L8 | Biconvex Positive (2x Asph) | 694532 - low-Tg molded lanthanum-crown class |
| L9 | Biconvex Positive | 497816 - low-dispersion crown class |
| L10 | Negative Meniscus | 806333 - high-index flint class |
| L11 | Negative Meniscus | 904313 - lanthanum-flint class |
| L12 | Positive Meniscus | 497816 - low-dispersion crown class |
| L13 | Biconvex Positive (1x Asph) | 689311 - low-Tg molded flint class |
| L14 | Biconcave Negative | 835427 - high-index lanthanum-flint class |
| L15 | Biconvex Positive | 541472 - flint class |
| L16 | Negative Meniscus | 883408 - high-index lanthanum-flint class |
| L17 | Biconvex Positive | 673322 - dense-flint class |