US 2020/0174231 A1 Example 1 — FUJIFILM / Taiga Noda
| 11 elements / 8 groups |
| f = 44.690 mm patent; 45 mm marketed |
| F/2.88 patent; F2.8 marketed |
| 1 aspherical element, 2 ED elements |
| Inner focus: six-element G2 moves with stop |
Inner focus. Patent Example 1 keeps G1 and G3 stationary while G2, including the stop, moves along the optical axis. Close focus is modeled by shifting G2 4.953 mm toward the object, consistent with Fujifilm's 0.45 m / 0.14x published specification under a front-vertex-to-object paraxial assumption.
| Element | Type | Glass |
|---|---|---|
| L1a | Negative Meniscus | S-TIL26 (OHARA) |
| L1b | Negative Meniscus | 487/704 fluorocrown class (FC5 / S-FSL5 / N-FK5 family) |
| L1c | Positive Meniscus | S-LAH55V (OHARA) |
| L2a | Biconvex Positive | S-LAL7 / S-LAL7Q (OHARA) |
| L2b | Positive Meniscus | FCD1 (HOYA) / S-FPL51 equivalent |
| L2c | Negative Meniscus | S-NSL36 (OHARA) |
| L2d | Biconcave Negative | E-FD15 / S-TIM35 class (699/301 dense flint) |
| L2e | Biconvex Positive | FCD1 (HOYA) / S-FPL51 equivalent |
| L2f | Biconvex Positive (2× Asph) | L-LAH85V (OHARA, low-Tg moldable class) |
| L3a | Positive Meniscus | S-LAH71 (OHARA) |
| L3b | Plano-Concave Negative | S-TIL25 (OHARA) |
Detailed analysis available in the interactive viewer above.