US 2020/0333569 A1 Example 1 — FUJIFILM / Kondo
| 8 ELEMENTS / 6 GROUPS |
| f ≈ 23.7 mm |
| F/2.06 |
| 2ω ≈ 62.0° |
| 4 ASPHERICAL SURFACES (2 ELEMENTS) |
G1+G2 integral unit focus; G3 fixed relative to image plane.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | S-TIH1 (OHARA) |
| L12 | Positive Meniscus | Unmatched (lanthanum-dense flint, near S-LAH79 (OHARA) nd match, Δνd ≈ 1.5) |
| L21 | Negative Meniscus | S-TIM35 (OHARA) |
| L22 | Biconvex Positive | S-LAH66 (OHARA) |
| L23 | Biconvex Positive (2× Asph) | Unmatched (near TAFD33 (HOYA), Δnd = 0.0017; possibly precision-molded proprietary) |
| L31 | Weak Neg. Meniscus (2× Asph) | S-BSL7 (OHARA) |
| L32 | Plano-Concave Negative | S-TIM35 (OHARA) |
| L33 | Plano-Convex Positive | Unmatched (same as L12; lanthanum-dense flint, near S-LAH79 (OHARA) nd match, Δνd ≈ 1.5) |
Detailed analysis available in the interactive viewer above.