JP2013-019993A EXAMPLE 2 (NEAR MATCH) — NIKON / HARUO SATO
| 9 ELEMENTS / 5 GROUPS (patent) · 6 GROUPS (production) |
| f ≈ 58.0 mm |
| F/1.4 |
| 2ω ≈ 41.7° |
| 2 ASPHERICAL SURFACES |
Unit focus — entire optical assembly translates forward via SWM helicoid. BFD increases at close focus.
| Element | Type | Glass |
|---|---|---|
| La | Pos. Meniscus (1× Asph) | Lanthanum dense flint (LASF-type, nd/νd match uncertain) |
| Lb1p | Positive Meniscus | S-LAL14 / N-LAK12 (lanthanum crown) |
| Lb1n | Negative Meniscus | S-FSL5 / FK5 (fluorine crown, low dispersion) |
| Lb2 | Negative Meniscus | S-TIH4 / N-SF8 (dense flint) |
| Lcn | Biconcave Negative | S-TIH11 / N-SF10 (dense flint) |
| Lcp | Biconvex Positive | S-LAH58 / N-LASF44 (high-index lanthanum) |
| Ldp1 | Biconvex Positive | S-LAH58 / N-LASF44 (high-index lanthanum, same family as Lcp) |
| Ldn | Biconcave Negative | Unmatched (KZFS2-type short flint; S-NBM51 name rejected by stored nd/vd) |
| Ldp2 | Biconvex Positive (1× Asph) | Same as La (lanthanum dense flint, LASF-type) |
Detailed analysis available in the interactive viewer above.