US 2012/0147254 A1 — Nobuyuki Adachi, Takuya Imaoka
| 10 ELEMENTS / 9 GROUPS |
| f = 7.850 mm patent / 8 mm marketed |
| F/3.5 marketed; patent F/2.951 |
| 180° diagonal fisheye |
| 1 ED ELEMENT |
Inner focus by L9. Variable gaps reproduce the patent's 1 m state; production MFD is 0.1 m.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-LAL14 (OHARA) |
| L2 | Negative Meniscus | S-LAL14 (OHARA) |
| L3 | Positive Meniscus | S-TIH6 (OHARA) |
| L4 | Biconcave Negative | S-FPL51 (OHARA) |
| L5 | Positive Meniscus | NBFD15 / NBFD15-W (HOYA) |
| L6 | Positive Meniscus | S-LAH66 (OHARA) |
| L7 | Positive Meniscus | S-BAL35 (OHARA) |
| L8 | Negative Meniscus | S-TIH53 (OHARA) |
| L9 | Biconvex Positive | S-PHM52 (OHARA) |
| L10 | Biconvex Positive | N-BK7 class (SCHOTT / S-BSL7 equivalent) |