JP 2019-144441 A, Numerical Example 1 — Jumpei Nakamoto
| 13 ELEMENTS / 10 GROUPS |
| DESIGN f = 67.95 mm |
| DESIGN F/2.90 |
| 3 ASPHERICAL SURFACES / 2 ELEMENTS |
PUBLISHED infinity, −0.5× and −1× states. Floating focus: G1 (G1A and G1B, L1–L7) and G2 (stop, L8–L10) extend toward the object along different paths, by 48.80 mm and 45.80 mm at 1:1, while G3 (L11–L13) stays fixed to the image. The S18–S19 air gap is the sum of the printed d18 and d19 rows. Positions between the published states are inferred along the printed gap paths and are not a factory cam, so distance labels there, above all near infinity, are approximate. The −1× state is the patent's own conjugate, 257.88 mm object to image; Sigma markets 25.8 cm. The iris stays at its infinity size: working f/# traces 2.91 / 3.86 / 4.82 against the printed 2.90 / 3.86 / 4.99.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconcave Negative | FC5 (HOYA, coordinate equivalent) |
| L2 | Negative Meniscus | FD60 (HOYA, coordinate equivalent) |
| L3 | Positive Meniscus | TAFD32 (HOYA, coordinate equivalent) |
| L4 | Biconvex Positive | E-FDS1 (HOYA, coordinate equivalent) |
| L5 | Biconvex Positive | FCD100 (HOYA, coordinate equivalent) |
| L6 | Biconvex Positive | FCD515 (HOYA, coordinate equivalent) |
| L7 | Biconcave Negative | E-FD5 (HOYA, coordinate equivalent) |
| L8 | Biconcave Negative | FC5 (HOYA, coordinate equivalent) |
| L9 | Biconvex Positive (Asph) | Unmatched (printed nd 1.55230, νd 71.54; line indices from printed PgF and PdC) |
| L10 | Biconvex Positive | FCD100 (HOYA, coordinate equivalent) |
| L11 | Negative Meniscus | NBFD10 (HOYA, coordinate equivalent) |
| L12 | Biconcave Negative | BACD16 (HOYA, coordinate equivalent) |
| L13 | Biconvex Positive (Asph) | Unmatched (printed nd 1.80280, νd 40.55; line indices from printed PgF and PdC) |