US 2010/0149663 A1 — Min Heu
| 5 ELEMENTS / 5 GROUPS |
| DESIGN f = 30.756 mm |
| DESIGN f/2.07 |
| 2ω = 50.66° |
| 1 ASPHERICAL SURFACE |
NO_INTERNAL_RECONSTRUCTION: the patent publishes only the infinity prescription. The production 0.25 m MFD is metadata only; no internal focus gaps are modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | J-LAK14 catalog equivalent; production supplier unspecified |
| L2 | Negative Meniscus (1× Asph) | Unmatched (684316 dense-flint class; vendor unresolved) |
| L3 | Negative Meniscus | H-ZF13 catalog equivalent; production supplier unspecified |
| L4 | Positive Meniscus | N-LASF44 catalog equivalent; production supplier unspecified |
| L5 | Biconvex Positive | S-LAH58 catalog equivalent; production supplier unspecified |