JP 2025-124346 A, Numerical Example 2 — Yuki Ueda
| 17 ELEMENTS / 12 GROUPS |
| DESIGN f = 82.63 mm |
| DESIGN F/1.24 |
| 4 ASPHERICAL SURFACES / 3 ELEMENTS |
| 2 SLD ELEMENTS |
PUBLISHED double floating focus: from infinity to the patent's 832 mm state, G2 (L4) moves 6.22 mm and G4 (L13–L14) moves 6.40 mm toward the object, while G1, G3, G5 and the stop stay fixed. Both end states are printed in the patent; intermediate positions are linear interpolations, not Sigma's focus law. The near state (831.74 mm object to image) is the patent's, not the marketed 840 mm minimum focus distance. The iris is held at its infinity F/1.24 setting, so the patent's near-focus F/1.31 is not reproduced; near close focus the outermost drawn on-axis rays fall outside the iris and are stopped there, drawn ending at the rear face of L6 just ahead of the stop, and the outer off-axis rays are vignetted.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | TAC6L (HOYA coordinate-compatible class; supplier unconfirmed) |
| L2 | Positive Meniscus | FCD705 (HOYA coordinate-compatible class; supplier unconfirmed) |
| L3 | Negative Meniscus | E-F5 (HOYA coordinate-compatible class; supplier unconfirmed) |
| L4 | Positive Meniscus (1× Asph) | L-LAH91 (OHARA coordinate-compatible class; supplier unconfirmed) |
| L5 | Biconvex Positive | FDS18-W (HOYA coordinate-compatible class; supplier unconfirmed) |
| L6 | Biconcave Negative | NBFD29 (HOYA coordinate-compatible class; supplier unconfirmed) |
| L7 | Biconcave Negative | NBFD29 (HOYA coordinate-compatible class; supplier unconfirmed) |
| L8 | Positive Meniscus | FCD515 (HOYA coordinate-compatible class; supplier unconfirmed) |
| L9 | Biconvex Positive | TAFD34 (HOYA coordinate-compatible class; supplier unconfirmed) |
| L10 | Biconcave Negative | NBFD29 (HOYA coordinate-compatible class; supplier unconfirmed) |
| L11 | Biconvex Positive | TAFD55-W (HOYA coordinate-compatible class; supplier unconfirmed) |
| L12 | Negative Meniscus | NBFD29 (HOYA coordinate-compatible class; supplier unconfirmed) |
| L13 | Negative Meniscus | FDS90-SG (HOYA coordinate-compatible class; supplier unconfirmed) |
| L14 | Biconvex Positive (1× Asph) | L-LAH91 (OHARA coordinate-compatible class; supplier unconfirmed) |
| L15 | Biconvex Positive | TAFD40L-W (HOYA coordinate-compatible class; supplier unconfirmed) |
| L16 | Biconcave Negative | LAF45 (HOYA coordinate-compatible class; supplier unconfirmed) |
| L17 | Biconcave Negative (2× Asph) | L-TIM28 (OHARA coordinate-compatible class; supplier unconfirmed) |