US 7,583,450 B2 Example 4 — Olympus / Ishii
| 12-60mm Four Thirds standard zoom |
| Patent f = 12.33 / 26.62 / 58.81mm |
| f/2.8-4.0; 7-blade circular diaphragm |
| 14 elements / 10 groups; 5 aspherical surfaces |
| 1 Super ED + 3 ED + 2 non-ED aspherical elements |
Internal focusing by translating the negative second group while reducing the internal G2 front/rear-unit gap.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-TIH53 (OHARA) |
| L2 | Plano-Convex Positive | S-BAL41 (OHARA, non-recommended) |
| L3 | Positive Meniscus | S-BSM14 (OHARA) |
| L4r | Neg. Meniscus (1× Asph) | Unmatched (UV-cured hybrid asphere resin; patent nd=1.51940) |
| L4g | Negative Meniscus | S-LAH58 (OHARA) |
| L5 | Biconcave Negative | S-FPL51 (OHARA) |
| L6 | Biconvex Positive | S-TIM22 (OHARA, non-recommended) |
| L7 | Neg. Meniscus (2× Asph) | M-LAC130 / P-LAK35 class (moldable LAK; soft match) |
| L8 | Biconvex Positive | S-BAL35 (OHARA) |
| L9 | Biconvex Positive | S-TIL1 (OHARA) |
| L10 | Biconcave Negative | S-LAH65V (OHARA) |
| L11 | Biconvex Positive (2× Asph, ED) | MP-FCD1-M20 / FCD1 class (HOYA moldable ED; soft match) |
| L12 | Biconvex Positive | S-FPL53 (OHARA) |
| L13 | Biconcave Negative | S-LAH58 (OHARA) |
| L14 | Biconvex Positive (ED) | S-FPL51 (OHARA) |
Detailed analysis available in the interactive viewer above.