WO 2021/199923 A1 — Takumu Yamada, Dai Matsuoka
| 14 elements / 11 groups |
| f = 14.42 mm design |
| F/1.85 design (marketed F/1.8) |
| 114° official diagonal angle |
| 6 aspherical surfaces |
Inner focus: L8-L13 (G2F) moves objectward by 1.69 mm; G1 and L14 remain fixed.
| Element | Type | Glass |
|---|---|---|
| L1 | Neg. Meniscus (2× Asph) | S-BAL42-class (OHARA; patent index aligns with catalog ne, 585/595) |
| L2 | Negative Meniscus | Unmatched (732547 patent e-line value; no verified d-line catalog identity) |
| L3 | Biconcave Negative | S-FPM2-class ED fluorophosphate (OHARA; soft match, 595/686) |
| L4 | Biconvex Positive | 694312 - short flint (Sony patent nd=1.69416, vd=31.2; no exact public catalog match) |
| L5 | Negative Meniscus | 910313 - dense lanthanum flint (Sony patent nd=1.91048, vd=31.3; no exact public catalog match) |
| L6 | Positive Meniscus | Unmatched (777/297 dense short flint; no close OHARA public-catalog match) |
| L7 | Biconvex Positive (2× Asph) | S-LAH66-class dense lanthanum flint (OHARA; soft match, 772/492) |
| L8 | Biconvex Positive | S-FPL53/S-FPL55-class super-ED fluorophosphate (OHARA; soft match, 438/951) |
| L9 | Biconvex Positive | S-FPL51-class ED fluorophosphate (OHARA; patent index aligns with catalog ne, 498/816) |
| L10 | Biconcave Negative | 863252 - dense flint (Sony patent nd=1.86252, vd=25.2; no exact public catalog match) |
| L11 | Biconvex Positive | Unmatched (933/209 ultra-high-index short flint) |
| L12 | Biconcave Negative | 863252 - dense flint (Sony patent nd=1.86252, vd=25.2; no exact public catalog match) |
| L13 | Biconcave Negative (2× Asph) | Unmatched (856401 patent e-line value; no verified d-line catalog identity) |
| L14 | Positive Meniscus | Unmatched (622639 patent e-line value; no verified d-line catalog identity) |