US 8,416,512 B2 — Example 3
| 12 glass elements / 10 groups |
| Patent f = 24.68 mm |
| Patent FNO = 1.43 |
| 2ω = 83.64° |
| 2 aspherical surfaces |
| 2 ED / anomalous-dispersion elements |
| Rear focusing |
Rear focusing: the complete second lens group Gr2 translates 4.410 mm toward the object side from infinity to close focus while Gr1 remains fixed.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | NBFD15 / J-LASFH6 class (806333 dense lanthanum flint) |
| L12 | Neg. Meniscus (1× Asph) | TAF1 / S-LAH66 / J-LASF016 class (773496 dense lanthanum flint) |
| L13 | Weak Negative Meniscus | S-BSM14 (OHARA, 603607 barium crown) |
| L14 | Biconvex Positive | FD60 / S-TIH6 / J-SF6 class (805255 dense flint) |
| L21 | Biconcave Negative ED | S-FPL51 (OHARA) / FCD1 class (497816 ED fluorophosphate) |
| L22 | Biconvex Positive | TAC8 / S-LAL18 / J-LAK18 class (729547 lanthanum crown) |
| L23a | Positive Meniscus | LBC3N class (606637 phosphate crown) |
| C1 | Optical Cement Layer | Patent cement medium (nd=1.51400, νd=42.83) |
| L23b | Biconcave Negative | E-FD5 / S-TIM25 / J-SF5 class (673322 dense flint) |
| L24a | Biconcave Negative | E-FD1L / S-TIH1 / J-SF1 class (717295 dense flint) |
| C2 | Optical Cement Layer | Patent cement medium (nd=1.51400, νd=42.83) |
| L24b | Biconvex Positive (1× Asph) | TAF1 / S-LAH66 / J-LASF016 class (773496 dense lanthanum flint) |
| L25 | Biconvex Positive ED | J-PSKH1 / FCD515 class (593679 abnormal-dispersion phosphate crown) |
| L26 | Positive Meniscus | LAC14 / S-LAL14 / J-LAK14 class (697555 lanthanum crown) |
Detailed analysis available in the interactive viewer above.