US 2019/0154946 A1, Example 5 — Ohashi / Ricoh
| 6 ELEMENTS / 4 GROUPS |
| f ≈ 18.3 mm (28 mm equiv.) |
| F/2.87 |
| 2ω ≈ 76.4° |
| 3 ASPHERICAL SURFACES (2 PGM ELEMENTS) |
Unit focus — entire lens assembly translates along axis. Normal mode 0.10 m to ∞; macro mode extends to 0.06 m.
| Element | Type | Glass |
|---|---|---|
| L11 | Neg. Meniscus (1× Asph) | OHARA L-BSL7 (PGM) |
| L12 | Biconcave Negative | OHARA S-TIM27 |
| L13 | Biconvex Positive | HOYA TAFD33 |
| L21 | Biconvex Positive | HOYA TAFD33 |
| L22 | Biconcave Negative | OHARA S-TIM35 |
| L23 | Neg. Meniscus (2× Asph) | 882372 - HOYA M-TAFD307 (PGM; patent Pg,F=0.5769) |
Detailed analysis available in the interactive viewer above.