JP 2006-201524 A, Example 1 — Tomoki Kono
| 17 ELEMENTS / 12 GROUPS |
| DESIGN f = 90.95–248.91 mm |
| DESIGN F/2.86 |
| ALL SPHERICAL |
| 3 ED ELEMENTS (MAKER) |
PUBLISHED: three infinity and three near-focus states. The G3 doublet moves toward the image by 3.7803, 9.0526 and 21.5429 mm at the wide, middle and tele settings; G1, G2 and G4 stay fixed during focus. Printed near object distances are about 2196 mm from the first surface, or about 2.5 m from the image plane, matching the maker's minimum focus distance. Intermediate positions are derived using image-plane diopters and G3 compensation; finite-conjugate MTF is available only at the three published near states.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | FD60 (HOYA catalog equivalent; production supplier unspecified) |
| L2 | Biconvex Positive | Unmatched (fluor-crown ED glass; printed nd 1.49700, νd 79.3 matches no catalog row) |
| L3 | Positive Meniscus | Unmatched (fluor-crown ED glass; printed nd 1.49700, νd 79.3 matches no catalog row) |
| L4 | Biconvex Positive | FD60 (HOYA catalog equivalent; production supplier unspecified) |
| L5 | Biconcave Negative | E-FL5 (HOYA catalog equivalent; production supplier unspecified) |
| L6 | Biconcave Negative | TAFD5G (HOYA catalog equivalent; production supplier unspecified) |
| L7 | Positive Meniscus | FD60 (HOYA catalog equivalent; production supplier unspecified) |
| L8 | Biconcave Negative | NBFD13 (HOYA catalog equivalent; production supplier unspecified) |
| L9 | Biconvex Positive | FC5 (HOYA catalog equivalent; production supplier unspecified) |
| L10 | Negative Meniscus | NBFD13 (HOYA catalog equivalent; production supplier unspecified) |
| L11 | Biconvex Positive | LAC14 (HOYA catalog equivalent; production supplier unspecified) |
| L12 | Biconvex Positive | FCD1 (HOYA catalog equivalent; production supplier unspecified) |
| L13 | Biconcave Negative | NBFD15 (HOYA catalog equivalent; production supplier unspecified) |
| L14 | Biconcave Negative | TAF1 (HOYA catalog equivalent; production supplier unspecified) |
| L15 | Biconvex Positive | FDS90 (HOYA catalog equivalent; production supplier unspecified) |
| L16 | Biconcave Negative | FD60 (HOYA catalog equivalent; production supplier unspecified) |
| L17 | Biconvex Positive | BAFD7 (HOYA catalog equivalent; production supplier unspecified) |