US 2014/0247506 A1 EXAMPLE 1 — FUJIFILM / ORI
| 10 ELEMENTS / 8 GROUPS |
| f = 61.06 mm (design) |
| F/2.48 (design) · F/2.4 (marketed) |
| 2ω = 25.4° (design) · 26.6° (marketed) |
| 2 ASPHERICAL SURFACES · 1 ED ELEMENT |
Unit focus — entire G1 (L11–L17 + aperture stop) translates forward as a rigid unit; G2 fixed.
| Element | Type | Glass |
|---|---|---|
| L11 | Plano-Convex Positive | S-FSL5 (OHARA) |
| L12 | Positive Meniscus | S-BAL35 (OHARA) |
| L13 | Positive Meniscus | S-LAL18 (OHARA) |
| L14 | Negative Meniscus | Dense flint (unidentified; nd/νd = 667/311) |
| L15 | Biconcave Negative | S-TIL27 (OHARA) — probable (νd corrected to ≈52.2; see header note) |
| L16 | Positive Meniscus | S-FPL51 (OHARA) — ED glass |
| L17 | Pos. Meniscus (2× Asph) | Lanthanum heavy flint (PGM, unidentified; nd/νd = 803/404) |
| L21 | Plano-Concave Negative | S-LAL18 (OHARA) |
| L22 | Positive Meniscus | S-NSL3 (OHARA) |
| L23 | Biconvex Positive | S-LAH65V (OHARA) — very close match |
Detailed analysis available in the interactive viewer above.