US 7,898,744 B2 Example 2 — Wada / Nikon Corporation
| 12 ELEMENTS / 9 GROUPS |
| f ≈ 58.0 mm (patent) / 60 mm (production) |
| F/2.88 |
| 2ω ≈ 39.7° |
| 2 ASPHERICAL SURFACES |
| 1 ED ELEMENT (L7) |
Internal floating focus: G2 moves toward image, G3 moves toward object. G1, G4, and aperture stop fixed. Total track 124.2 mm (constant). G2 travel: 11.2 mm, G3 travel: 21.4 mm.
| Element | Type | Glass |
|---|---|---|
| L1 | Neg. Meniscus (1× Asph) | S-LAH63Q (OHARA) |
| L2 | Positive Meniscus | H-LAK6A (CDGM) or Nikon melt |
| L3 | Biconvex Positive | TAFD5 (HOYA) |
| L4 | Neg. Meniscus (1× Asph) | S-BSL7 (OHARA) / N-BK7 (Schott) |
| L5 | Biconcave Negative | S-TIM2 (OHARA) |
| L6 | Biconvex Positive | S-LAH58 (OHARA) |
| L7 | Biconvex Positive | S-FPM4 (OHARA) — ED glass |
| L8 | Biconvex Positive | S-PHM53 (OHARA) |
| L9 | Negative Meniscus | S-TIH53 (OHARA) / N-SF57 (Schott) |
| L10 | Negative Meniscus | S-TIH6 (OHARA) |
| L11 | Negative Meniscus | NBFD3 (HOYA) |
| L12 | Positive Meniscus | S-TIH53 (OHARA) / N-SF57 (Schott) |
Detailed analysis available in the interactive viewer above.