US4447137 Example 2 — Asahi / Yasunori Arai
| 7 elements / 6 groups |
| f = 134.99 mm |
| F/1.8 |
| 2ω = 18° |
| all-spherical |
| fixed rear element focus |
Fixed rear element extension: L1-L6 move together while L7 remains fixed at the rear.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | S-BSM16 (OHARA) / N-SK16 / BACD16 class |
| L2 | Negative Meniscus | S-BAH28 (OHARA) / BAFD8 class |
| L3 | Positive Meniscus | S-LAL14 (OHARA) / LAC14 class |
| L4 | Negative Meniscus | S-TIM25 (OHARA) / N-SF5 / E-FD5 class |
| L5 | Weak Positive Meniscus | S-BAH27 (OHARA) / BAFD7 class |
| L6 | Positive Meniscus | K-LaFn11 (Sumita) / H-LaF72 class |
| L7 | Positive Meniscus | J-LAF01 (Hikari) / H-LaF51 class |
Detailed analysis available in the interactive viewer above.