US 6,115,188 A — Akihiro Nishio, Hideki Ogawa, Makoto Misaka
| 15 MODELED ELEMENTS / 11 GROUPS |
| PATENT f = 490.56 mm; ARRAY EFL ≈ 491.36 mm |
| F/4.1 DESIGN / f/4 MARKETED |
| 2ω = 5.0° |
| INNER FOCUS + TRANSVERSE IS GROUP |
CONSTRAINED_RECONSTRUCTION: the cemented L2 focus doublet translates 16.833981615 mm imageward from infinity to the normalized 4.497548307 m close state; D12 increases and D15 decreases equally, preserving 114.07 mm. The reconstruction is solved from Canon's marketed 4.5 m MFD. L3b image-stabilization motion is transverse only.
| Element | Type | Glass |
|---|---|---|
| L1a | Biconvex Positive | 497816 — low-dispersion / UD coordinate class |
| L1b-1 | Biconvex Positive | 497816 — low-dispersion / UD coordinate class |
| L1b-2 | Biconcave Negative | 835427 — lanthanum dense-crown coordinate class |
| L1c-1 | Biconvex Positive | Fluorite (CaF2; manufacturer-correlated crystal) |
| L1c-2 | Negative Meniscus | 516641 — S-BSL7 / K-BK7 coordinate class |
| L2-1 | Biconvex Positive | 805254 — dense-flint coordinate class |
| L2-2 | Biconcave Negative | 835427 — lanthanum dense-crown coordinate class |
| L3a-1 | Negative Meniscus | 847239 — dense-flint coordinate class |
| L3a-2 | Biconvex Positive | 835427 — lanthanum dense-crown coordinate class |
| L3b-1 | Biconvex Positive | 847239 — dense-flint coordinate class |
| L3b-2 | Biconcave Negative | 678553 — lanthanum crown coordinate class |
| L3b-3 | Biconcave Negative | 734515 — lanthanum crown coordinate class |
| L3c-1 | Biconvex Positive | 697555 — lanthanum crown coordinate class |
| L3c-2 | Biconvex Positive | 517524 — crown coordinate class |
| L3c-3 | Negative Meniscus | 720437 — legacy S-LAM52 / H-LaF62 coordinate class |