US 6,621,643 B2 — Haruo Sato
| 12 physical elements / 11 groups (14 material layers modeled) |
| Production: 28-200mm f/3.5-5.6 |
| Patent design: 29.1-192mm f/3.6-5.9 |
| 3 ED elements |
| 3 aspherical components / 4 aspherical surfaces |
| Published G2 inner focus; modeled close distance 0.430 m |
PUBLISHED G2 inner focusing. The second group translates toward the object while D5 decreases and D14 increases with D5 + D14 conserved at each zoom station. Published close-state G2 travel is 1.36966 mm at 29.1 mm, 1.80154 mm at 50 mm, and 8.25666 mm at 192 mm. The patent model focuses to 0.430 m from the image plane at all three zoom stations; the production lens was marketed at 0.44 m.
| Element | Type | Glass |
|---|---|---|
| L11a | Negative Meniscus | 847238 — dense flint class |
| L11b | Positive Meniscus | J-LAK01 (Hikari; patent code 640601) |
| L12 | Positive Meniscus | J-FKH1 (Hikari; patent code 498825) |
| L21r | Negative Meniscus (1× Asph, Hybrid Resin) | Unmatched (optical resin, nd=1.553890, νd=38.09) |
| L21g | Negative Meniscus | 835427 — lanthanum flint class |
| L22 | Biconcave Negative | 773496 — lanthanum flint class |
| L23 | Biconvex Positive | 808228 — very dense flint class |
| L24 | Biconcave Negative | 773496 — lanthanum flint class |
| L31 | Biconvex Positive | J-FKH1 (Hikari; patent code 498825) |
| L32 | Positive Meniscus | J-FKH1 (Hikari; patent code 498825) |
| L33 | Negative Meniscus | 847238 — dense flint class |
| L1 | Biconvex Positive (2× Asph) | 517641 — borosilicate crown class |
| L2r | Positive Meniscus (1× Asph, Hybrid Resin) | Unmatched (optical resin, nd=1.553890, νd=38.09) |
| L2g | Negative Meniscus | 804466 — lanthanum flint class |