US 6,061,180 — Shingo Hayakawa
| 16 elements / 12 groups |
| 28-135mm f/3.5-5.6 marketed; 28.891-131.182mm patent design |
| 135 full-frame / Canon EF |
| One GMo asphere; unit II inner focus; unit V optical IS |
Inner focus by complete negative unit II moving objectward; close-focus spacings are a first-order reconstruction constrained to Canon's 0.5 m minimum focus distance.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-TIH53 (OHARA) |
| L2 | Positive Meniscus | S-LAL14 (OHARA) |
| L3 | Positive Meniscus | S-LAL8 (OHARA) |
| L4 | Negative Meniscus | S-LAH55V (OHARA) |
| L5 | Biconcave Negative | S-LAH65V (OHARA) |
| L6 | Biconvex Positive | S-TIH53 (OHARA) |
| L7 | Biconcave Negative | S-LAH55V (OHARA) |
| L8 | Negative Meniscus | S-TIH53 (OHARA) |
| L9 | Biconvex Positive | S-BSM14 (OHARA) |
| L10 | Biconvex Positive | S-NSL36 (OHARA) |
| L11 | Biconcave Negative | S-LAH55V (OHARA) |
| L12 | Positive Meniscus | S-TIH6 (OHARA) |
| L13 | Biconcave Negative | S-BAH27 (OHARA) |
| L14 | Biconvex Positive | S-BAH28 (OHARA) |
| L15 | Biconvex Positive (1× Asph) | L-BAL42 (OHARA) |
| L16 | Negative Meniscus | S-TIH53 (OHARA) |