JP 2011-170128 A — Yukihiro Yamamoto
| 11 ELEMENTS / 8 GROUPS |
| DESIGN f = 83.58 mm |
| DESIGN F/1.46 |
| 1 ASPHERICAL SURFACE / 1 ELEMENT |
PUBLISHED focus gap, derived image distance: rear focus with the front group L1 and the image plane fixed. The patent prints d6 at infinity and at 0.85 m (15.2520 → 4.8554 mm) but no back focus, so the infinity image distance is the paraxial back focus of the printed table (39.512 mm). The rear group L2, with the iris, advances 10.3966 mm toward the object, giving 849.998 mm object-to-image at 1:8.64 (marketed 0.85 m, 1:8.6). Positions between the two printed states are linearly interpolated.
| Element | Type | Glass |
|---|---|---|
| E1 | Positive Meniscus | FCD1 (HOYA, coordinate equivalent) |
| E2 | Positive Meniscus | TAC8 (HOYA, coordinate equivalent) |
| E3 | Negative Meniscus | E-F5 (HOYA, coordinate equivalent) |
| E4 | Negative Meniscus | E-FD10 (HOYA, coordinate equivalent) |
| E5 | Positive Meniscus | TAFD5G (HOYA, coordinate equivalent) |
| E6 | Negative Meniscus (Aspheric) | Unmatched (molded-asphere glass; nd 1.58763 / vd 61.08) |
| E7 | Biconcave Negative | E-FD5 (HOYA, coordinate equivalent) |
| E8 | Negative Meniscus | E-FD10 (HOYA, coordinate equivalent) |
| E9 | Biconvex Positive | TAFD30 (HOYA, coordinate equivalent) |
| E10 | Biconvex Positive | TAFD30 (HOYA, coordinate equivalent) |
| E11 | Negative Meniscus | E-FD7 (HOYA, coordinate equivalent) |