JP 2013-156459 A Example 4 — Sigma / Kōno
| 8 ELEMENTS / 6 GROUPS |
| f ≈ 29.6 mm |
| F/2.8 |
| 2ω ≈ 52.1° |
| 1 ASPHERICAL SURFACE |
Front-group unit focus: G1 (L1–L5 + aperture stop) translates forward along the optical axis.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | S-LAH58 (OHARA) |
| L2 | Biconcave Negative | S-TIM25 (OHARA) |
| L3 | Biconcave Negative | S-TIM28 (OHARA) |
| L4 | Biconvex Positive | S-LAH58 (OHARA) |
| L5 | Biconvex Positive (1× Asph) | S-LAL59 (OHARA, probable) |
| L6 | Negative Meniscus | S-TIM2 (OHARA) |
| L7 | Negative Meniscus | S-TIL6 (OHARA) |
| L8 | Biconvex Positive | S-LAH79 (OHARA) |
Detailed analysis available in the interactive viewer above.