US 2014/0204265 A1 — Toshihiro Sunaga
| 6 ELEMENTS / 6 GROUPS |
| 4 POWER GROUPS (+/−/+/−) |
| f = 20.421 mm (DESIGN) |
| F/2.89 (DESIGN) |
| 2ω = 71.96° |
| 5 ASPHERICAL SURFACES / 3 LENSES |
Rear focus: G4 (L6) moves 1.21 mm imageward from infinity to the patent short-distance state.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-TIL26 (OHARA; 567/428 catalog match) |
| L1r | Negative Resin Meniscus (1× Asph) | Unmatched (proprietary aspherical resin; patent nd=1.534, νd=41.71) |
| L2 | Positive Meniscus | S-LAH65VS (OHARA; 804/465 catalog match) |
| L3 | Negative Meniscus (2× Asph) | E-FD8 class (HOYA; 689/312 catalog-code match) |
| L4 | Positive Meniscus | S-LAL18 (OHARA; 729/547 catalog match) |
| L5 | Biconvex Positive (2× Asph) | M-TAFD51 (HOYA; 821/427 catalog match) |
| L6 | Biconcave Negative | S-TIH53 (OHARA; 847/238 catalog match) |