US 2008/0062534 A1, Example 1 — Atsujiro Ishii, Hirohiko Kimata
| 12 ELEMENTS / 9 GROUPS |
| DESIGN f = 40.9–146.7 mm |
| DESIGN F/4.08–5.81 |
| ALL SPHERICAL |
| 1 ED ELEMENT (MAKER) |
PUBLISHED internal focus: negative G2 (L3–L6) moves objectward, by 1.30 / 3.33 / 4.97 mm at WE / ST / TE from infinity to OD = 900 mm (measured from the image plane); G1, G3 and the iris remain fixed. The patent prints infinity and 900 mm rows at those three zoom positions only; the other zoom and focus positions are interpolated, so their distance labels are approximate. The 0.9 m close focus matches Olympus's minimum focusing distance throughout the zoom.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | N-SK14 (catalog equivalent; supplier unconfirmed) |
| L2 | Negative Meniscus | S-TIH53 (catalog equivalent; supplier unconfirmed) |
| L3 | Negative Meniscus | S-TIH6 (catalog equivalent; supplier unconfirmed) |
| L4 | Biconcave Negative | N-BK7 (catalog equivalent; supplier unconfirmed) |
| L5 | Positive Meniscus | S-TIH53 (catalog equivalent; supplier unconfirmed) |
| L6 | Negative Meniscus | S-LAH66 (catalog equivalent; supplier unconfirmed) |
| L7 | Biconvex Positive | S-FSL5 (catalog equivalent; supplier unconfirmed) |
| L8 | Biconvex Positive | S-FPL51 (catalog equivalent; supplier unconfirmed) |
| L9 | Negative Meniscus | S-LAM66 (catalog equivalent; supplier unconfirmed) |
| L10 | Positive Meniscus | S-TIL27 (catalog equivalent; supplier unconfirmed) |
| L11 | Biconvex Positive | N-BK7 (catalog equivalent; supplier unconfirmed) |
| L12 | Negative Meniscus | S-LAH66 (catalog equivalent; supplier unconfirmed) |