JP 2003-005030 A — Kouichi Ohshita
| 4 elements / 3 groups |
| f ≈ 45.0 mm |
| f/2.8 (patent FNO 2.88) |
| 2ω = 50.3° patent |
| all-spherical |
Unit focusing: the whole optical cell extends about 5.73 mm from infinity to Nikon's 0.45 m minimum focus distance.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | S-LAH59 (OHARA; 816/466 class) |
| L2 | Biconcave Negative | S-TIM28 (OHARA; 689/311 class) |
| L3 | Biconcave Negative | S-TIM28 (OHARA; 689/311 class) |
| L4 | Biconvex Positive | S-LAH58 (OHARA; 883/408 class) |