US 6,115,188 A — Akihiro Nishio, Hideki Ogawa, Makoto Misaka
| 15 modeled elements / 11 groups |
| Patent f = 585.20 mm; computed EFL ≈ 585.328 mm |
| Design F/4.12; marketed f/4 |
| 2ω = 4.2° |
| 1 FLUORITE + 2 UD ELEMENTS |
| Inner focus + transverse IS |
CONSTRAINED_RECONSTRUCTION: patent L2 cemented doublet translates 18.829163964 mm imageward; D12 increases and D15 decreases by the same amount from infinity to Canon's published 5.5 m MFD. L3b is the transverse IS subunit and has no authored axial state.
| Element | Type | Glass |
|---|---|---|
| L1a-1 | Biconvex Positive | 497815/497816 low-dispersion crown class (vendor unresolved; Canon-correlated UD) |
| L1b-1 | Positive Meniscus | 497815/497816 low-dispersion crown class (vendor unresolved; Canon-correlated UD) |
| L1b-2 | Biconcave Negative | 835427 high-index lanthanum class (vendor unresolved) |
| L1c-1 | Positive Meniscus | Fluorite (CaF2), manufacturer-correlated |
| L1c-2 | Negative Meniscus | 516641 crown class (S-BSL7/K-BK7 coordinate equivalents; vendor unresolved) |
| L2-1 | Biconvex Positive | 805254 dense-flint class (N-SF6/S-TIH6 family; vendor unresolved) |
| L2-2 | Biconcave Negative | 835427 high-index lanthanum class (vendor unresolved) |
| L3a-1 | Negative Meniscus | 847238/847239 dense-flint class (vendor unresolved; source vd rounded 23.9) |
| L3a-2 | Biconvex Positive | 603606/603607 SK14/BSM14 crown class (vendor unresolved) |
| L3b-1 | Biconvex Positive | 847238/847239 dense-flint class (vendor unresolved; source vd rounded 23.9) |
| L3b-2 | Biconcave Negative | 603606/603607 SK14/BSM14 crown class (vendor unresolved) |
| L3b-3 | Biconcave Negative | 804466 lanthanum class (vendor unresolved) |
| L3c-1 | Biconvex Positive | 720437 lanthanum-flint class (vendor unresolved) |
| L3c-2 | Biconvex Positive | 750350 lanthanum-flint class (vendor unresolved) |
| L3c-3 | Biconcave Negative | 847238/847239 dense-flint class (vendor unresolved; source vd rounded 23.9) |