JP H08-110467 A — Tadashi Endo
| 11 elements / 9 groups |
| Patent EFL 20.498624 mm; retained at printed scale |
| f/2.8 marketed; f/2.9 patent design |
| 94° marketed diagonal field; 93.1° patent field |
| All-spherical negative-positive retrofocus |
| Rear focus; complete L2 moves objectward |
Rear focus: fixed negative L1; complete positive L2, including the stop, moves 2.977699 mm objectward in the paraxial 0.25 m reconstruction.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | S-BSM15 (OHARA 623582 coordinate equivalent) |
| L12 | Negative Meniscus | S-BSM14 (OHARA 603607 coordinate equivalent) |
| L13 | Biconvex Positive | S-BAL42 (OHARA 583594 coordinate equivalent) |
| L21 | Negative Meniscus | S-LAH66 (OHARA 773496 historical/current special-order coordinate match) |
| L22 | Positive Meniscus | PBH6 / S-TIH6 coordinate (OHARA 805254 equivalent; actual melt unspecified) |
| L23 | Biconvex Positive | S-BSL7 (OHARA 516641 coordinate equivalent; catalog νd = 64.14) |
| L24 | Biconcave Negative | TIM11 (OHARA historical 621359 exact coordinate match) |
| L25 | Positive Meniscus | PBH6 / S-TIH6 coordinate (OHARA 805254 equivalent; actual melt unspecified) |
| L26 | Biconcave Negative | PBH53 (OHARA historical 847239 exact coordinate match) |
| L27 | Biconvex Positive | S-FSL5 (OHARA 487702 coordinate match) |
| L28 | Biconvex Positive | S-LAH66 (OHARA 773496 historical/current special-order coordinate match) |