JP 2023-049919 A — Yuki Shibata
| 7 ELEMENTS / 7 GROUPS |
| EFL 87.261 mm MODEL / 87.30 mm PATENT |
| 90 mm / f/2.8 MARKETED |
| F/2.88 / 2ω = 27.44° PATENT |
| 27.4° VM / 27.5° SL IIs MARKETED AOV |
| 5 APD ELEMENTS (MANUFACTURER-MARKED) |
| ALL-SPHERICAL UNIT FOCUS |
PUBLISHED unit focus: the full optical assembly extends 10.70 mm; BF changes from 39.64 mm at infinity to 50.34 mm at the patent's ZD0 = 800 mm state.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus (convex to object) | TAC8 (HOYA optical equivalent; patent vendor unspecified) |
| L2 | Positive Meniscus (convex to object) | FCD100 (HOYA optical equivalent; patent vendor unspecified) |
| L3 | Positive Meniscus (convex to object) | FCD100 (HOYA optical equivalent; patent vendor unspecified) |
| L4 | Negative Meniscus (convex to object) | N-KZFS5 (SCHOTT optical equivalent; patent vendor unspecified) |
| L5 | Negative Meniscus (convex to object) | N-LASF46B (SCHOTT optical equivalent; patent vendor unspecified) |
| L6 | Biconvex Positive | NBFD11 (HOYA optical equivalent; patent vendor unspecified) |
| L7 | Negative Meniscus (convex to image) | J-LASF014 (Hikari optical equivalent; patent vendor unspecified) |