US 2013/0148006 A1 — Numerical Example 1
| 6 elements / 5 groups |
| f = 14.5456 mm design; 14 mm nominal |
| F2.5 nominal; F2.521 design |
| 75° diagonal angle of view |
| 5 aspherical surfaces on 3 lenses |
Inner focus: front unit and rear unit fixed; positive G2 moves 0.909 mm toward the object at 0.18 m. Close spacings are paraxially inferred from official 0.10× magnification because the patent publishes only infinity spacing.
| Element | Type | Glass |
|---|---|---|
| L1 | Neg. Meniscus (2× Asph) | S-BAL42 / L-BAL42 / M-BACD12 class (583/594 barium crown; patent nd=1.58332) |
| L2 | Positive Meniscus | TAFD35 class (911/353 high-index lanthanum glass) |
| L3 | Negative Meniscus | S-TIH53 / FDS90 class (847/238 dense flint) |
| C1 | Optical Cement Layer | UV-curing optical cement (patent-listed nd=1.56732, νd=42.8) |
| L4 | Positive Meniscus | S-LAH58 / TAFD30 class (883/408 lanthanum dense flint) |
| L5 | Biconvex Positive (2× Asph) | S-BAL42 / L-BAL42 / M-BACD12 class (583/594 barium crown; patent nd=1.58250) |
| L6 | Biconcave Negative (1× Asph) | Unmatched dense flint (684/313; nearest S-TIM28 / M-FD80 class is 689/311) |
Detailed analysis available in the interactive viewer above.