US 4,170,403 Example 1 — Konishiroku / Shimokura
| 5 ELEMENTS / 5 GROUPS |
| f ≈ 35.00 mm |
| F/2.8 |
| 2ω = 64° |
| ALL-SPHERICAL |
Unit focus approximation; whole optical unit translates and only the final back focal distance changes.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-BSL7 (OHARA) |
| L2 | Biconvex Positive | J-LAF04 (HIKARI) |
| L3 | Biconcave Negative | S-TIH13 (OHARA) |
| L4 | Positive Meniscus | S-LAL14 (OHARA) |
| L5 | Positive Meniscus | S-LAL8 (OHARA) |
Detailed analysis available in the interactive viewer above.