US 10,168,507 B2, Example 4 — Ryosuke Nagami, Tetsuya Ori
| 9 ELEMENTS / 7 GROUPS |
| 50 mm f/2 (MARKETED) |
| f = 48.52 mm / F2.06 (DESIGN) |
| 2ω = 32.2° AT INFINITY |
| 2 ASPHERICAL SURFACES |
| INNER FOCUS |
Inner focus: G2 (L21) moves toward the image. Infinity and 1 m states are published; the 0.39 m endpoint is reconstructed from the production minimum focus distance.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive | 744449/744448 LAF2/LAM2 class (supplier unspecified) |
| L12 | Positive Meniscus | 744449/744448 LAF2/LAM2 class (supplier unspecified) |
| L13 | Plano-Concave Negative | 640345 S-TIM27 class (supplier unspecified) |
| L14 | Biconvex Positive (2× Asph) | 497816 low-dispersion / ED class (supplier unspecified) |
| L15 | Biconcave Negative | 689312 dense-flint class (supplier unspecified) |
| L16 | Biconvex Positive | H-ZLaF68N class (supplier unspecified) |
| L21 | Negative Meniscus | S-FSL5 coordinate-compatible fluor-crown proxy (supplier unspecified) |
| L31 | Biconcave Negative | 541472 QF8/FEL2/TIL2/LLF2 class (supplier unspecified) |
| L32 | Biconvex Positive | 729547/729545 LaK/LAL class (supplier unspecified) |