JP S56-140311 — Ryoichi Doi, Yutaka Sakai, Kazunori Ohno
| 6 elements / 4 groups |
| f ≈ 65.0 mm |
| F/5.6 |
| 2ω = 75° |
| All-spherical |
Unit focus; patent publishes only infinity data, so close focus is represented by increasing BFD for a 1 m object-distance paraxial estimate.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-NSL3 (OHARA) |
| L2 | Biconvex Positive | S-LAL13 (OHARA, close; patent vd=53.4) |
| L3 | Biconcave Negative | S-TIL26 (OHARA) |
| L4 | Biconcave Negative | S-TIL26 (OHARA) |
| L5 | Biconvex Positive | S-LAL13 (OHARA, close; patent vd=53.4) |
| L6 | Negative Meniscus | S-TIM5 (OHARA) |