US 2010/0033848 A1 — Takahiro Hatada
| 13 ELEMENTS / 10 GROUPS |
| f = 24.539 mm (DESIGN) |
| f/1.4 MARKETED; f/1.45 PATENT |
| 84° PUBLISHED DIAGONAL FIELD |
| 2 ASPHERICAL SURFACES |
| REAR FOCUS |
Rear focus: L1 fixed; complete L2 moves objectward. Close spacings are a paraxial inference from the published 0.25 m MFD.
| Element | Type | Glass |
|---|---|---|
| E1 | Negative Meniscus (convex to object) | S-LAH55V (OHARA; representative exact nd/νd match) |
| E2 | Negative Meniscus (rear asphere) | Unmatched (1.58373/59.0 glass-moldable crown; S-BAL42/L-BAL42 class) |
| E3 | Biconvex Positive | S-LAH58 (OHARA; representative exact nd/νd match) |
| E4 | Biconcave Negative | Unmatched (1.49700/81.5 anomalous low-dispersion crown; S-FPL51 class) |
| E5 | Biconvex Positive | S-LAH55V (OHARA; representative exact nd/νd match) |
| E6 | Biconvex Positive | S-LAH60 (OHARA; representative exact nd/νd match) |
| E7 | Biconcave Negative | S-TIM5 (OHARA; representative exact nd/νd match) |
| E8 | Biconcave Negative | BPH5 (OHARA historical 654397 spectral match; supplier inferred) |
| E9 | Biconvex Positive | Unmatched (1.49700/81.5 anomalous low-dispersion crown; S-FPL51 class) |
| E10 | Positive Meniscus (concave to object) | S-FSL5 (OHARA; representative exact nd/νd match) |
| E11 | Negative Meniscus (convex to image) | S-TIH53 (OHARA; representative exact nd/νd match) |
| E12 | Biconvex Positive | S-PHM52 (OHARA; representative close nd/νd match) |
| E13 | Positive Meniscus (front asphere, convex to image) | Unmatched (1.85100/40.4 glass-moldable dense lanthanum flint; S-LAH89/L-LAH85V class) |