JP2019144477A Example 1 — Sigma
| 17 elements / 12 groups |
| f = 101.85 mm design |
| F1.46 design / f/1.4 nominal |
| 2ω = 23.85° |
| 2 aspherical surfaces |
Internal rear-group focus: G2 moves objectward; G1 and the image plane remain fixed.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | BACED5 (Hoya) / N-SSK5 class |
| L2 | Positive Meniscus | FCD100 (Hoya) / S-FPL53 class (fluorite-class FLD) |
| L3 | Positive Meniscus | FCD100 (Hoya) / S-FPL53 class (fluorite-class FLD) |
| L4 | Negative Meniscus | E-ADF10 (Hoya) / N-KZFS4 class |
| L5 | Positive Meniscus | FCD100 (Hoya) / S-FPL53 class (fluorite-class FLD) |
| L6 | Negative Meniscus | S-NBM51 (Ohara) / N-KZFS4 class |
| L7 | Biconvex Positive | S-LAH55V (Ohara) / TAFD5G class (dense lanthanum flint) |
| L8 | Biconcave Negative | S-NBM51 (Ohara) / N-KZFS4 class |
| L9 | Positive Meniscus | E-FDS1 (Hoya) / N-SF66 class |
| L10 | Positive Meniscus | PCD40 (HOYA, SLD class) |
| L11 | Positive Meniscus | FCD515 (Hoya, SLD class) |
| L12 | Negative Meniscus | S-NBH56 (Ohara) dense-flint class |
| L13 | Biconcave Negative | S-NBH5 (Ohara) / E-ADF50 class |
| L14 | Biconvex Positive | TAFD32 (Hoya) dense-lanthanum class |
| L15 | Positive Meniscus | TAFD35 (Hoya) dense-lanthanum class |
| L16 | Biconcave Negative | E-FD2 (Hoya) / N-SF2 class |
| L17 | Biconvex Positive (2× Asph) | M-TAFD305 class (Hoya, soft match; patent nd=1.84915) |
Detailed analysis available in the interactive viewer above.