JP 2010-72639 A — Yoshifumi Sudoh
| 8 ELEMENTS / 6 GROUPS |
| 6.0 mm |
| f/1.9 marketed / f/1.93 modeled |
| 2ω = 78.2° |
| 2 ASPHERICAL SURFACES |
PUBLISHED patent states only: infinity to 300 mm object-to-image-plane focus. Group I shifts 0.10 mm imageward while Group II shifts 0.14 mm objectward; the stop remains fixed. The production 1 cm macro endpoint is not reconstructed.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-FSL5 (OHARA) |
| L2 | Negative Meniscus (Rear Asphere) | L-BSL7 (OHARA) |
| L3 | Biconvex Positive | S-LAH59 (OHARA) |
| L4 | Biconvex Positive | S-FPL51 (OHARA) |
| L5 | Negative Meniscus | S-TIH4 (OHARA) |
| L6 | Negative Meniscus | S-TIM1 (OHARA) |
| L7 | Biconvex Positive | S-FPL51 (OHARA) |
| L8 | Positive Meniscus (Front Asphere) | L-BSL7 (OHARA) |