US 2015/0098138 A1, Example 2 — Takashi Shirasuna
| 14 ELEMENTS / 11 GROUPS |
| 35.4218 mm DESIGN EFL |
| F/1.45 MODELED |
| 62.843° DESIGN FIELD |
| 2 ASPHERICAL SURFACES |
Modeled rear focus: L2 moves toward the object while L1 stays fixed. The near endpoint is inferred from Canon’s 0.28 m / 0.21× specifications; the patent publishes only the infinity prescription.
| Element | Type | Glass |
|---|---|---|
| E1 | Negative Meniscus (rear asphere) | 583594 — BAL42 class (OHARA S-BAL42 spectral proxy; patent vendor unresolved) |
| E2 | Biconcave Negative | 487702 — FSL5/FK5 class (OHARA S-FSL5 spectral proxy; patent vendor unresolved) |
| E3 | Biconvex Positive | 911353 — high-index low-dispersion class (CDGM H-ZLaF4LA spectral proxy; patent vendor unresolved) |
| E4 | Biconcave Negative | 532488 — TIL6/LLF6/QF6A class (OHARA S-TIL6 spectral proxy; patent vendor unresolved) |
| E5 | Biconvex Positive | 497816 — FPL51/FCD1 class (OHARA S-FPL51 spectral proxy; patent vendor unresolved) |
| E6 | Biconcave Negative | 805254 — TIH6/SF6 class (OHARA S-TIH6 spectral proxy; patent vendor unresolved) |
| E7 | Biconvex Positive | 729547 — LAL18/TAC8 class (OHARA S-LAL18 spectral proxy; patent vendor unresolved) |
| E8 | Biconvex Positive | 911353 — high-index low-dispersion class (CDGM H-ZLaF4LA spectral proxy; patent vendor unresolved) |
| E9 | Biconvex Positive | 497816 — FPL51/FCD1 class (OHARA S-FPL51 spectral proxy; patent vendor unresolved) |
| E10 | Biconcave Negative | 654397 — NBH5/KZFS5 class (OHARA S-NBH5 spectral proxy; patent vendor unresolved) |
| E11 | Negative Meniscus | 805254 — TIH6/SF6 class (OHARA S-TIH6 spectral proxy; patent vendor unresolved) |
| E12 | Positive Meniscus | 729547 — LAL18/TAC8 class (OHARA S-LAL18 spectral proxy; patent vendor unresolved) |
| E13 | Biconvex Positive | 595677 — FPM2 class (OHARA S-FPM2 spectral proxy; patent vendor unresolved) |
| E14 | Positive Meniscus (front asphere) | 854404 — LAH85V class (OHARA L-LAH85V spectral proxy; patent vendor unresolved) |