JP 2021-189351A EXAMPLE 4 — NIKON / FURUIDA
| 6 ELEMENTS / 4 GROUPS |
| f ≈ 41.2 mm |
| F/2.04 |
| 2ω ≈ 55.4° |
| 2 ASPHERICAL SURFACES (HYBRID COMPOSITE) |
Inner focus (IF): G2 (L21–L23) translates toward the object. G1, aperture stop, and G3 remain fixed.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive | S-LAH55 (OHARA) |
| L12 | Biconcave Negative | S-TIH23 (OHARA) |
| L21 | Biconcave Negative | PBM18Y (OHARA) |
| L22 | Biconvex Positive | S-LAH64 (OHARA) |
| L22r | Pos. Meniscus (1× Asph) | UV-curable photopolymer (Nikon) |
| L23 | Positive Meniscus | S-LAH55 (OHARA) |
| L31r | Neg. Meniscus (1× Asph) | UV-curable photopolymer (Nikon) |
| L31 | Biconcave Negative | E-CF6 (HOYA) |
Detailed analysis available in the interactive viewer above.