US 2020/0192060 A1 Example 2 — Nittoh Inc. / Sawamoto
| 10 ELEMENTS / 7 GROUPS |
| f = 120.0 mm |
| F/3.5 |
| 2ω ≈ 26° |
| ALL SPHERICAL |
Triple-group inner focus (G2 + G4 + G5 move toward object); constant overall length. G4 is primary focus element (40 mm travel). G5 reversal motion fine-tunes aberrations at macro magnifications.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive | S-LAH71 (OHARA) |
| L21 | Biconvex Positive | S-FPM3 (OHARA) |
| L22 | Biconcave Negative | S-TIH13 (OHARA) |
| L23 | Positive Meniscus | S-LAH88 (OHARA) |
| L31 | Biconvex Positive | 893204 - ultra-high-dispersion flint (S-NPH4 code match; patent nd=1.89286, vd=20.36) |
| L32 | Biconcave Negative | S-TIM25 (OHARA) |
| L41 | Biconvex Positive | S-FSL5 (OHARA) |
| L51 | Biconcave Negative | S-NBH55 (OHARA) |
| L52 | Biconvex Positive | S-LAH88 (OHARA) |
| L61 | Biconcave Negative | E-FD15L (HOYA) / S-TIM35 (OHARA) |
Detailed analysis available in the interactive viewer above.