US 7,864,451 B2 Example 1 — Canon / Taki
| 15 ELEMENTS / 12 GROUPS |
| f = 100.0 mm |
| F/2.8 (design F/2.92) |
| 2ω ≈ 24.4° |
| ALL-SPHERICAL DESIGN |
| HYBRID IS (L5a decentering) |
Dual-group floating inner focus. L2 moves toward image; L4 moves toward object. L1, L3, L5 fixed. Constant overall length. Ring-type USM drive.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive | S-LAL18 (OHARA) |
| L12 | Positive Meniscus | S-LAL18 (OHARA) |
| L13 | Biconcave Negative | Dense lanthanum flint (801/350, unmatched in public OHARA catalog) |
| L14 | Biconvex Positive | S-FPL51 (OHARA) |
| L21 | Biconcave Negative | S-TIH11 (OHARA) |
| L22 | Biconcave Negative | S-TIL27 (OHARA) |
| L23 | Positive Meniscus | S-TIH53 (OHARA) |
| L31 | Positive Meniscus | Dense lanthanum flint (801/350, unmatched in public OHARA catalog) |
| L41 | Biconvex Positive | S-PHM52 (OHARA) |
| L42 | Biconvex Positive | S-LAL18 (OHARA) |
| L43 | Biconcave Negative | S-TIH53 (OHARA) |
| L5a1 | Positive Meniscus | S-TIH53 (OHARA) |
| L5a2 | Biconcave Negative | S-LAM52 (OHARA) |
| L5b1 | Negative Meniscus | S-NBM51 (OHARA) |
| L5b2 | Biconvex Positive | S-LAM66 (OHARA) |
Detailed analysis available in the interactive viewer above.