US 4,792,219 EMBODIMENT 3 — OLYMPUS / MIHARA
| 9 ELEMENTS / 9 GROUPS |
| f ≈ 90.0 mm |
| F/2.0 |
| 2ω ≈ 27° |
| ALL SPHERICAL |
Differential-speed whole-lens advance. Groups I+II advance as a unit; Group III advances at 63% of subsystem speed. Single variable gap d₁₃ expands from 0.80 mm (∞) to 18.25 mm (1/2×). Helicoid travel ≈ 47 mm.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | TAC4 (HOYA) |
| L2 | Positive Meniscus | TACL1 (HOYA) |
| L3 | Negative Meniscus | FD4 (HOYA) |
| L4 | Negative Meniscus | BACL1 (HOYA) |
| L5 | Positive Meniscus | LAF7 (HOYA) |
| L6 | Biconvex Positive | TAFL3 (HOYA) |
| L7 | Biconcave Negative | CFKL2 (HOYA) |
| L8 | Negative Meniscus | FD5 (HOYA) |
| L9 | Biconvex Positive | BSC7 (HOYA) |
Detailed analysis available in the interactive viewer above.