JP2023063766A EXAMPLE 1 — COSINA / OGINO
| 9 ELEMENTS / 7 GROUPS |
| f = 49.998 mm |
| F/1.0 |
| 2ω = 47.9° |
| 3 ASPHERICAL SURFACES |
Mirrorless production variants focus to 0.45 m and advertise a floating mechanism; JP2023063766A discloses only the infinity prescription, so close focus is approximated with the image-side air gap.
| Element | Type | Glass |
|---|---|---|
| L1 | Pos. Meniscus (1× Asph) | S-LAH93 (OHARA, patent nd/vd match) |
| L2 | Positive Meniscus | TAFD37A (HOYA, patent nd/vd match) |
| L3 | Negative Meniscus | SF6 / S-TIH6 (OHARA) |
| L4f | Biconcave Negative | S-TIH14 (OHARA, patent nd/vd match) / SF14-family dense flint |
| L4r | Biconvex Positive | S-LAH58 (OHARA) |
| L5 | Biconvex Positive | S-LAH58 (OHARA) |
| L6f | Biconvex Positive | S-LAH58 (OHARA) |
| L6r | Biconcave Negative | Unmatched (553551 crown; patent nd=1.55298, νd=55.07) |
| L7 | Neg. Meniscus (2× Asph) | Unmatched (808406 high-index lanthanum glass; patent nd=1.80835, νd=40.55) |
Detailed analysis available in the interactive viewer above.