US 3,830,559 EXAMPLE 1 — OLYMPUS / MATSUBARA
| 10 ELEMENTS / 8 GROUPS |
| f ≈ 24.0 mm |
| F/2.0 |
| 2ω ≈ 84° |
| ALL-SPHERICAL |
Helicoid unit focus with floating correction (components IV+V translate together).
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | J-LAF04 class (HIKARI), 757479 |
| L2 | Negative Meniscus | N-SK16 class (SCHOTT) / S-BSM16 (OHARA), 620603 |
| L3 | Negative Meniscus | N-SK16 class (SCHOTT) / S-BSM16 (OHARA), 620603 |
| L4 | Negative Meniscus | S-LAL52 class (OHARA) / E-LAK02 (HIKARI), 670573 |
| L5 | Negative Meniscus | S-LAH66 class (OHARA), 773496 |
| L6 | Biconvex Positive | S-TIM8 class (OHARA), 596392 |
| L7 | Positive Meniscus | S-LAH66 class (OHARA), 773496 |
| L8 | Biconcave Negative | S-TIM28 class (OHARA), 689311 |
| L9 | Positive Meniscus | S-LAL14 class (OHARA) / N-LAK14 (SCHOTT), 697556 |
| L10 | Biconvex Positive | S-LAL14 class (OHARA) / N-LAK14 (SCHOTT), 697556 |
Detailed analysis available in the interactive viewer above.