US 7,307,794 B2 — Masakazu Saori
| 12 ELEMENTS / 9 GROUPS |
| 18-55mm f/3.5-5.6 (marketing) |
| Design f = 19.10-55.16 mm |
| 2ω = 75.8°-28.6° |
| 1 ASPHERICAL SURFACE |
| 0.25 m MFD |
CONSTRAINED_RECONSTRUCTION: the patent focuses with G1 but publishes no close-focus row. At each zoom endpoint, only G1 is translated objectward to a 0.25 m image-plane-referenced object distance; G2-G4 and IMG remain fixed. Solved G1 travel is 4.590939 mm at wide and 4.532077 mm at tele.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | 603607 class (SK/BACD family; patent vendor unspecified) |
| L12 | Negative Meniscus | 623582 class (OHARA S-BSM15 optical position; patent vendor unspecified) |
| L13 | Neg. Meniscus (1x Asph) | Unmatched (nd=1.52538, vd=56.3; code position 525563) |
| L14 | Positive Meniscus | 847238 class (dense-flint family; patent vendor unspecified) |
| L21 | Biconvex Positive | Unmatched (nd=1.51601, vd=49.9; code position 516499) |
| L22 | Biconvex Positive | 487702 class (OHARA S-FSL5 optical position; patent vendor unspecified) |
| L23 | Negative Meniscus | Unmatched (nd=1.84333, vd=24.2; code position 843242) |
| L31 | Positive Meniscus | 847240 class (nearest current family 847238; patent vendor unspecified) |
| L32 | Biconcave Negative | 773496 class (lanthanum-flint family; patent vendor unspecified) |
| L41 | Biconvex Positive | Unmatched (nd=1.64118, vd=58.9; code position 641589) |
| L42 | Biconvex Positive | Unmatched (nd=1.51601, vd=50.6; code position 516506) |
| L43 | Negative Meniscus | 756288 class (nearest current dense-flint family 755275/276; patent vendor unspecified) |