JP 2000-321497 A — Haruo Sato
| 15 ELEMENTS / 11 GROUPS |
| DESIGN f = 24.7-82.5 mm |
| DESIGN F/2.8-4.1 |
| 2 ASPHERICAL SURFACES / 2 ELEMENTS |
| G2 INTERNAL FOCUS / 1:2 MACRO |
PUBLISHED: G2 moves toward the object while the other groups and the image plane stay fixed. Table 1 prints a β = −0.033 row and a 0.5 m near row at 24.7, 50 and 82.5 mm, and a 1:2 macro row (β = −0.5) at 50 and 82.5 mm; G2 travels 0.89, 5.81 and 6.59 mm to the closest row. Object distances are calculated from the printed gaps. The 0.5 m near rows match the marketed minimum focus; the patent's 50 mm macro row (0.18 m) is closer than the marketed 0.21 m macro distance at 85 mm. Intermediate zoom stations and focus samples are interpolated.
| Element | Type | Glass |
|---|---|---|
| L11n | Negative Meniscus | S-TIH53 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L11p | Biconvex Positive | S-LAH97 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L12 | Positive Meniscus | S-LAH97 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L21r | Hybrid Resin Layer (1× Asph) | Unmatched (source nd=1.495210, νd=56.34; commercial identity unverified) |
| L21g | Negative Meniscus | S-LAH55VS (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L22 | Biconcave Negative | S-LAL61 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L23p | Biconvex Positive | S-TIH13 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L23n | Negative Meniscus | S-LAH65 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L24 | Negative Meniscus | S-LAM60 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L31 | Biconvex Positive | S-PHM53 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L32p | Biconvex Positive | S-PHM53 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L32n | Biconcave Negative | S-LAH60 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L41 | Biconvex Positive | S-LAM60 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| Lasp | Neg. Meniscus (1× Asph) | N-LAF35 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L4n | Biconcave Negative | S-LAH60 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L4p | Biconvex Positive | K-SSK1 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |