JP 2012-58682 A Example 4 — Sigma / Ogasawara
| 16 elements / 11 groups |
| 105 mm marketed; 101.71 mm design |
| F2.8 marketed; F2.91 design |
| 2ω = 24.09° design |
| Floating inner focus; L3a optical stabilizer |
| All spherical surfaces |
Floating inner focus. L2a (E5-E7) moves imageward and L2c (E9-E11) moves objectward from infinity to 1:1 while L1, L2b/stop, L3a, and L3b remain fixed relative to the image plane.
| Element | Type | Glass |
|---|---|---|
| E1 | Biconvex Positive | TAF3D / N-LASF44 class; close to OHARA S-LAH65VS (dense lanthanum flint) |
| E2 | Biconvex Positive | S-FPL51 (OHARA) / FCD1 (HOYA) class |
| E3 | Biconcave Negative | S-TIH14 (OHARA) class |
| E4 | Positive Meniscus | FCD515 (HOYA) / S-FPM2-neighbor class |
| E5 | Biconcave Negative | S-TIM5 (OHARA) / F5 class |
| E6 | Biconcave Negative | N-BK7 / BSC7 class (517642) |
| E7 | Positive Meniscus | S-TIH53 (OHARA) |
| E8 | Biconvex Positive | S-TIH6 (OHARA) / SF6 class |
| E9 | Biconvex Positive | TAF3D / N-LASF44 class; close to OHARA S-LAH65VS (dense lanthanum flint) |
| E10 | Biconvex Positive | S-LAL18 (OHARA) |
| E11 | Biconcave Negative | S-TIH14 (OHARA) class |
| E12 | Positive Meniscus | S-TIH6 (OHARA) / SF6 class |
| E13 | Biconcave Negative | S-LAH66 (OHARA) / TAF1 / N-LAF34 class |
| E14 | Biconcave Negative | NBFD15 (HOYA) / H-ZLaF56B class |
| E15 | Biconvex Positive | S-LAL18 (OHARA) |
| E16 | Biconvex Positive | M-BACD5N (HOYA) |
Detailed analysis available in the interactive viewer above.