JP 2019-211703 A — Numerical Example 1
| 8 elements / 7 groups |
| f = 43.93 mm design / 45 mm marketed |
| F2.90 design / F2.8 marketed |
| 2ω = 51.10° |
| 4 aspherical surfaces on 2 elements |
| Internal G2 focus, 3.480 mm travel |
Internal focusing by translating G2 (L3-L5) 3.480 mm toward the object; G1, stop, and G3 remain fixed.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus (2× Asph) | M-TAF105 (HOYA) |
| L2 | Negative Meniscus | E-CF6 (HOYA) |
| L3 | Biconcave Negative | E-FD15 (HOYA) |
| L4 | Biconvex Positive | TAFD32 (HOYA) |
| L5 | Biconvex Positive (2× Asph) | M-BACD5N (HOYA) |
| L6 | Negative Meniscus | S-NBH52V (OHARA) |
| L7 | Negative Meniscus | FF8 (HOYA) |
| L8 | Biconvex Positive | FDS16-W (HOYA) |
Detailed analysis available in the interactive viewer above.