US 2004/0218274 A1 — Misako Aoki
| 15 ELEMENTS / 13 GROUPS |
| 24.720-116.500 mm DESIGN |
| F/3.604-5.903 DESIGN |
| 2ω = 85.16°-20.24° |
| 2 ASPHERICAL SURFACES |
| G2 INNER FOCUS / L3A VR |
CONSTRAINED_RECONSTRUCTION: patent G2-only internal focus. Close rows are solved at 0.5 m from the focal plane by changing D5 and D14 by equal/opposite amounts while G3 and all rear groups remain fixed; tele |m| = 0.209821.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | 847238 — dense-flint class (vendor unresolved) |
| L12 | Positive Meniscus | 755523 — lanthanum-crown class (vendor unresolved) |
| L13 | Positive Meniscus | 816466 — high-index lanthanum-crown class (vendor unresolved) |
| L21r | Bonded Aspheric Resin/Composite Layer | Unmatched (thin bonded aspheric resin/composite layer; nd=1.553890, vd=38.09) |
| L21 | Negative Meniscus | 835427 — high-index lanthanum class (vendor unresolved) |
| L22 | Biconcave Negative | 835427 — high-index lanthanum class (vendor unresolved) |
| L23 | Biconvex Positive | 785257 — dense-flint class (vendor unresolved) |
| L24 | Negative Meniscus | 835427 — high-index lanthanum class (vendor unresolved) |
| L3AN | Negative Meniscus | 805254 — dense-flint class (vendor unresolved) |
| L3AP | Biconvex Positive | 497816 — ED fluorophosphate class (vendor unresolved) |
| L33 | Pos. Meniscus (1× Asph) | 517641/517642 — BK7-class crown (vendor unresolved) |
| L41 | Positive Meniscus | 847238 — dense-flint class (vendor unresolved) |
| L42 | Biconcave Negative | 835427 — high-index lanthanum class (vendor unresolved) |
| L51 | Biconvex Positive | 497816 — ED fluorophosphate class (vendor unresolved) |
| L52 | Biconvex Positive | 487702/487704 — low-index FK/FSL crown class (vendor unresolved) |
| L53 | Negative Meniscus | 847238 — dense-flint class (vendor unresolved) |