JP 2012-003015 A, Example 1 — Takashi Kubota
| 9 ELEMENTS / 6 GROUPS |
| f = 18.24 mm (28 mm equiv.) |
| F/2.56 |
| 2ω = 76.0° |
| 2 ASPHERICAL SURFACES |
Floating focus — Group 1 (L1–L4 with the stop) and Group 2 (L5–L9) both advance toward the object; Group 2 moves farther (1.68 mm vs 1.07 mm at 200 mm).
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-LAL7 (OHARA) |
| L2 | Biconvex Positive (1× Asph) | L-LAH81 (OHARA discontinued low-softening glass, 806404; coordinate equivalent, supplier unconfirmed) |
| L3 | Biconcave Negative | S-TIM3 (OHARA) |
| L4 | Biconvex Positive | S-LAH55V (OHARA) |
| L5 | Biconvex Positive | S-LAH55V (OHARA) |
| L6 | Biconcave Negative | S-TIL27 (OHARA) |
| L7 | Biconcave Negative | S-TIH53 (OHARA) |
| L8 | Biconvex Positive | S-LAH55V (OHARA) |
| L9 | Positive Meniscus (1× Asph) | L-LAH85V (OHARA) |