JP 2021-043376 A — Yasuyuki Sugano
| 10 ELEMENTS / 8 GROUPS |
| f ≈ 49.3 mm |
| F/1.93 |
| 2ω ≈ 47.4° |
| 4 ASPHERICAL SURFACES |
| 2 PATENT-LISTED APD ELEMENTS |
Patent F36 floating focus: front group, Jb, and Ja+LE move 8.94, 8.54, and 5.53 mm toward the object. Close endpoint is 0.455 m from the image plane (370 mm from surface 1). Intermediate motion is interpolated.
| Element | Type | Glass |
|---|---|---|
| LF | Biconcave Negative | Unmatched (patent glass; supplier unspecified) |
| Lfa | Pos. Meniscus (2× Asph) | Unmatched (patent nd=1.85249, νd=42.08; supplier unspecified) |
| Lfb | Biconvex Positive | S-FPL51 / N-PK52A (catalog-compatible equivalents; supplier unspecified) |
| Lfc | Biconvex Positive | FCD505 (catalog-compatible model; supplier unspecified) |
| Lfd | Negative Meniscus | Unmatched (patent glass; supplier unspecified) |
| Lrd | Biconcave Negative | Unmatched (patent nd=1.70269, νd=34.87; partial dispersion unspecified) |
| Lrc | Biconvex Positive | Unmatched (patent nd=1.79334, νd=47.18; supplier unspecified) |
| Lrb | Biconvex Positive | S-LAH65V (catalog-compatible model; supplier unspecified) |
| Lra | Biconcave Negative | Unmatched (patent nd=1.55362, νd=45.38; supplier unspecified) |
| LE | Neg. Meniscus (2× Asph) | S-BSL7 / N-BK7 (catalog-compatible equivalents; supplier unspecified) |