US 8,081,392 B2 Example 3 — Ishii / Shimizu, Olympus
| 18 elements / 17 groups |
| 14–35 mm f/2.0 marketed; 14.22–34.28 mm patent |
| Four Thirds mount and format |
| Four aspherical surfaces |
| Split-G2 floating inner focus |
Floating inner focus by the split negative second group. The G2F–G2R spacing changes with subject distance but remains identical at a given subject distance across the zoom range.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-TIH53 (OHARA) |
| L2 | Plano-Convex Positive | S-LAH66 (OHARA) |
| L3 | Positive Meniscus | S-LAH66 (OHARA) |
| L4 | Negative Meniscus | S-LAH58 (OHARA) |
| L5 | Neg. Meniscus (2× Asph) | S/L-BAL42-class molded barium crown (OHARA class; exact public catalog match not found) |
| L6 | Negative Meniscus | S-FSL5 (OHARA) |
| L7 | Biconvex Positive | S-TIH53 (OHARA) |
| L8 | Biconcave Negative | S-TIM2 (OHARA) |
| L9 | Positive Meniscus | S-LAH51 (OHARA) |
| L10 | Positive Meniscus | S-TIM27 (OHARA) |
| L11 | Biconvex Positive | S-BSM10 (OHARA) |
| L12 | Negative Meniscus | S-TIL27 (OHARA) |
| L13 | Biconvex Positive (ED) | S-FPL51 (OHARA) |
| L14 | Biconcave Negative | S-TIM28 (OHARA) |
| L15 | Biconvex Positive (Super ED) | S-FPL53 (OHARA) |
| L16 | Negative Meniscus | S-LAH95 (OHARA; catalog νd ≈ 31.34) |
| L17 | Biconvex Positive (ED, 2× Asph) | S-FPL51 / FCD1-class moldable ED (exact public catalog match not found) |
| L18 | Positive Meniscus | Unmatched proprietary short flint (635/232, condition-b APD glass) |
Detailed analysis available in the interactive viewer above.