US 2012/0019926 A1 — Akira Yamagami
| 12 ELEMENTS / 9 GROUPS |
| 10.3-29.1 mm patent design |
| f/3.5-5.6 marketed |
| 3 ASPHERICAL SURFACES |
| INNER FOCUS + VR SHIFT GROUP |
Inner focus by image-ward translation of the L21+L22 cemented doublet.
| Element | Type | Glass |
|---|---|---|
| L11 | Neg. Meniscus (1× Asph) | M-TAFD305 (HOYA) |
| L12 | Negative Meniscus | S-LAH58 (OHARA) |
| L13 | Positive Meniscus | FDS90 (HOYA) / N-SF57 class |
| L14 | Positive Meniscus | S-NPH1 (OHARA) |
| L21 | Neg. Meniscus (1× Asph) | M-NBFD10 (HOYA) |
| L22 | Positive Meniscus | S-LAL18 (OHARA) |
| L23 | Biconvex Positive | FC5 (HOYA) / N-FK5 class |
| L24 | Biconvex Positive | 617540 - K-SSK1 / SSK1 class (no source-backed catalog match) |
| L25 | Negative Meniscus | S-TIH4 (OHARA) |
| L31 | Biconcave Negative | S-LAH53 (OHARA; S-LAH53V class) |
| L32 | Positive Meniscus | S-LAL12 (OHARA; S-LAL12Q class) |
| L33 | Pos. Meniscus (1× Asph) | M-LAF81 (HOYA) |