US 2005/0068636 A1 — Satoshi Hayakawa
| 15 elements / 13 groups (physical count) |
| 18-70mm f/3.5-4.5 (production) |
| 18.7-67.9mm f/3.6-4.6 (Example 1) |
| 3 ED elements / 1 aspherical element (production) |
| G2 internal focus |
| Nikon F / DX |
CONSTRAINED_RECONSTRUCTION: the patent specifies G2 focusing but no close-focus spacings. Close states are code-solved at Nikon's 0.38 m MFD with a fixed image plane and rigid G2 translation (D5 += delta, physical D14 -= delta). G2 shifts objectward by 1.415523 mm at 18.7 mm, 2.234433 mm at 35.0 mm, and 4.721413 mm at 67.9 mm; the tele state gives paraxial |m| = 0.160020 versus Nikon's marketed 0.16 maximum reproduction ratio.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus (convex to object) | 847238 class |
| L12 | Positive Meniscus (convex to object) | S-BSM81 catalog equivalent (patent 640601; production supplier unspecified) |
| L13 | Positive Meniscus (convex to object) | 713539 class |
| L21r | Hybrid Aspheric Resin Layer (1x Asph) | Unmatched (hybrid aspheric resin; patent nd=1.55389, vd=38.1) |
| L21 | Negative Meniscus (convex to object) | 804466 class |
| L22 | Biconcave Negative | 804466 class |
| L23 | Biconvex Positive | J-LAFH3 catalog equivalent (patent 795285; production supplier unspecified) |
| L24 | Negative Meniscus (concave to object) | 804466 class |
| L31 | Negative Meniscus (convex to object) | 804396 class |
| L32 | Biconvex Positive | J-FKH1 catalog equivalent (patent 498826; production supplier unspecified) |
| L33 | Biconvex Positive | 487704 class |
| L41 | Positive Meniscus (concave to object) | 847238 class |
| L42 | Biconcave Negative | 835427 class |
| L51 | Positive Meniscus (concave to object) | J-FKH1 catalog equivalent (patent 498825; production supplier unspecified) |
| L52 | Biconvex Positive | J-FKH1 catalog equivalent (patent 498825; production supplier unspecified) |
| L53 | Negative Meniscus (concave to object) | 805254 class |