US 2020/0301101 A1 — Numerical Example 3
| 12 elements / 10 groups |
| f = 83.41 mm design; 85 mm marketed |
| F1.46 design; F1.4 marketed |
| 2ω = 29.0° design; 28.5° marketed |
| 2 aspherical surfaces |
Rear focus: the patent states that G1 is fixed and G2 moves toward the object for close focus; no close-focus variable-gap table is published, so this data file carries the verified infinity prescription only.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconcave Negative | S-NBM51 (OHARA) |
| L12 | Biconvex Positive | S-FPL53 (OHARA) / FCD100 class |
| L13 | Positive Meniscus | S-LAH58 (OHARA) |
| L14 | Biconvex Positive | S-FPL53 (OHARA) / FCD100 class |
| L21 | Positive Meniscus | TAFD32 (HOYA, 871/407 lanthanum class) |
| L22 | Positive Meniscus | S-FPL53 (OHARA) / FCD100 class |
| L23 | Negative Meniscus | S-NBH52V (OHARA) |
| L24′ | Biconcave Negative | S-NBH52V (OHARA) |
| L25′ | Biconvex Positive | S-LAH92 (OHARA) |
| L26′ | Biconcave Negative | S-NBH53V (OHARA) |
| L27′ | Biconvex Positive | S-LAH55V (OHARA) |
| L28′ | Biconvex Positive (2× Asph) | M-LAC130 / MP-LAC130 (HOYA, moldable lanthanum crown) |
Detailed analysis available in the interactive viewer above.