JP S61-090115 — Koichi Wakamiya
| 6 elements / 6 groups |
| f = 105 mm |
| f/4.5 |
| 2ω = 23.4° |
| CaF₂ + SiO₂ |
Unit focusing; modeled by BF extension from infinity to β = -0.5.
| Element | Type | Glass |
|---|---|---|
| E1 | Biconcave Negative | Fused silica (SiO2, patent material) |
| E2 | Biconvex Positive | Calcium fluoride (CaF2, patent material) |
| E3 | Biconvex Positive | Calcium fluoride (CaF2, patent material) |
| E4 | Biconcave Negative | Fused silica (SiO2, patent material) |
| E5 | Biconvex Positive | Calcium fluoride (CaF2, patent material) |
| E6 | Negative Meniscus | Fused silica (SiO2, patent material) |