US 8,248,716 B2 Example 1 — Olympus Imaging Corp.
| 11 elements / 8 production groups (9 patent groups) |
| f = 12.187 mm design |
| F/2.051 design / f/2.0 nominal |
| 84° corrected field |
| 4 aspherical surfaces |
Rear internal focus: only L11 / LRF moves toward the object at close focus. The gap after 19A contracts while the back-focus gap after 21 increases.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-LAH51 (OHARA) |
| L2 | Neg. Meniscus (2× Asph) | S-LAL12 (OHARA) |
| L3 | Biconvex Positive | S-LAH58 (OHARA) |
| L4 | Biconcave Negative | S-FSL5 (OHARA) |
| L5 | Positive Meniscus | S-TIH18 (OHARA) |
| L6 | Negative Meniscus | S-TIH14 (OHARA) |
| L7 | Biconvex Positive | S-LAM59 (OHARA) |
| L8 | Biconcave Negative | S-TIH6 (OHARA) |
| L9 | Biconvex Positive | S-LAH58 (OHARA) |
| L10 | Biconvex Positive (2× Asph) | S-LAM60 (OHARA) |
| L11 | Biconvex Positive | S-NSL36 (OHARA) |
Detailed analysis available in the interactive viewer above.