US 2001/0007512 A1 — Takayuki Sensui
| 10 PHYSICAL ELEMENTS / 8 PATENT GROUPS |
| PATENT DESIGN f = 36.000 mm |
| MODELED f/3.6 |
| 2ω = 89.6° AT y = 34.85 mm |
| 2 ASPHERICAL SURFACES |
| PUBLISHED REAR-FOCUS ENDPOINT m = 0.200 |
PUBLISHED rear focus: G2 (13–19A, including STO) translates 7.810 mm objectward. The patent endpoint is m=0.200 and solves to 0.336052 m object-to-image distance; the marketed 0.3 m / 0.25x values are not forced onto this prescription.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | 773496 — lanthanum-flint class (vendor unresolved) |
| L2g | Negative Meniscus | 729547 — lanthanum-crown class (vendor unresolved) |
| L2r | Negative Meniscus (1× Asph) | Unmatched (synthetic resin; patent nd=1.52700, νd=43.7) |
| L3 | Biconvex Positive | 755275 — dense-flint class (vendor unresolved) |
| L4 | Positive Meniscus | 517524 — crown-flint class (vendor unresolved) |
| L5 | Negative Meniscus | 804466 — lanthanum-flint class (vendor unresolved) |
| L6 | Positive Meniscus | 518590 — crown class (vendor unresolved) |
| L7 | Biconvex Positive | 487702 — fluor-crown class (vendor unresolved) |
| L8 | Negative Meniscus | 847238 — special dense-flint class (vendor unresolved) |
| L9 | Negative Meniscus | 847238 — special dense-flint class (vendor unresolved) |
| L10 | Biconvex Positive (1× Asph) | Unmatched (barium-crown vicinity; no exact public-catalog match) |