US 2015/0085165 A1, Numerical Example 3 — Masaki Maruyama, Masaharu Hosoi, Hiroshi Koizumi
| 12 ELEMENTS / 10 GROUPS |
| DESIGN f = 24.72-67.90 mm |
| DESIGN F/4.10 |
| 9 ASPHERICAL SURFACES / 5 ELEMENTS |
Inner focus by G4 (L11), the group the patent names for focusing. The patent prints infinity spacings only, so the close-focus state is reconstructed: G4 moves toward the image by 0.94 mm at wide, 1.86 mm at middle and 2.79 mm at tele, keeping d19 + d21 constant, to reach Sony's 0.4 m minimum focus distance. The back focus does not change. Computed magnification at 0.4 m is 0.08× / 0.14× / 0.20×.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | 847238 — high-index dense flint class |
| L2 | Positive Meniscus | 618634 — low-dispersion crown class |
| L3 | Neg. Meniscus (2× Asph) | 882372 — high-index glass class |
| L4 | Biconcave Negative | 773496 — lanthanum glass class |
| L5 | Positive Meniscus | 946180 — high-dispersion flint class |
| L6 | Pos. Meniscus (2× Asph) | 882372 — high-index glass class |
| L7 | Biconvex Positive (1× Asph) | 773495 — lanthanum glass class |
| L8 | Biconcave Negative | 755275 — dense flint class |
| L9 | Biconvex Positive | 497816 — ED fluorophosphate class |
| L10 | Biconvex Positive (2× Asph) | 731405 — lanthanum glass class |
| L11 | Neg. Meniscus (2× Asph) | 773495 — lanthanum glass class |
| L12 | Plano-Concave | 487704 — low-dispersion crown class |