US 2011/0273780 A1 — Numerical Example 1
| 11 elements / 9 groups |
| 18-55mm f/3.5-5.6 marketed |
| Patent EFL 18.49 / 27.38 / 53.51mm |
| 4 aspherical surfaces |
| Single-lens OSS; rear focus |
Rear focus by axial motion of the single negative/aspherical fourth group L10. Close-focus spacings are paraxial estimates for Sony's 0.25 m published MFD; the patent table is infinity-only.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-TIH53 (OHARA) |
| L2 | Positive Meniscus | S-LAL18 (OHARA) |
| L3 | Negative Meniscus | S-NBH53 (OHARA) |
| L4 | Biconcave Negative (1x Asph) | 851401 - high-index lanthanum-flint-class moldable glass (M-TAFD305 code match; L-LAH85 attribution unconfirmed) |
| L5 | Biconvex Positive | S-NPH2 (OHARA) |
| L6 | Positive Meniscus (OSS) | S-PHM52 (OHARA; patent νd = 63.39) |
| L7 | Biconvex Positive | S-FSL5 (OHARA) |
| L8 | Negative Meniscus | S-TIH6 (OHARA) |
| L9 | Positive Meniscus (1x Asph) | 729540 - lanthanum-crown-class moldable glass (M-TAC80 code match) |
| L10 | Negative Meniscus (2x Asph) | 851401 - high-index lanthanum-flint-class moldable glass (M-TAFD305 code match; L-LAH85 attribution unconfirmed) |
| L11 | Plano-Convex Positive | E-FL5 (HOYA) |
Detailed analysis available in the interactive viewer above.