JP 2009-175324 A, Numerical Example 1 — Makoto Misaka
| 16 ELEMENTS / 12 GROUPS |
| DESIGN f = 18.60–193.23 mm |
| DESIGN F/3.60–5.88 |
| 2 ASPHERICAL SURFACES / 2 ELEMENTS |
| 2 UD ELEMENTS |
Inner focus. The patent prints infinity spacings only and prefers focusing by moving the negative group L2 (E4–E7) toward the object (¶0082). Here L2 moves that way, D5 shorter and D13 longer by the same amount, with the image plane fixed; the travel to Canon's 0.45 m minimum focus is 0.92 mm at 18.6 mm, 2.07 mm at 49.94 mm and 8.90 mm at 193.23 mm. These finite spacings are derived, not printed. The zoom positions between the three printed focal lengths follow a derived cam (Gpf and Gpr move together, as ¶0039 describes), not Canon's factory cam.
| Element | Type | Glass |
|---|---|---|
| E1 | Meniscus Negative | NBFD15 (HOYA catalog equivalent; production supplier unspecified) |
| E2 | Biconvex Positive | S-FPL51 (OHARA catalog equivalent; production supplier unspecified) |
| E3 | Meniscus Positive | S-BSM14 (OHARA catalog equivalent; production supplier unspecified) |
| E4 | Meniscus Negative | S-LAH55V (OHARA catalog equivalent; production supplier unspecified) |
| E5 | Biconcave Negative | S-LAH66 (OHARA catalog equivalent; production supplier unspecified) |
| E6 | Biconvex Positive | S-TIH6 (OHARA catalog equivalent; production supplier unspecified) |
| E7 | Biconcave Negative | S-LAH66 (OHARA catalog equivalent; production supplier unspecified) |
| E8 | Biconvex Positive (Asph) | L-BAL42 (OHARA catalog equivalent; production supplier unspecified) |
| E9 | Meniscus Negative | S-TIH6 (OHARA catalog equivalent; production supplier unspecified) |
| E10 | Biconvex Positive | S-FSL5 (OHARA catalog equivalent; production supplier unspecified) |
| E11 | Biconcave Negative | S-LAL8 (OHARA catalog equivalent; production supplier unspecified) |
| E12 | Meniscus Positive | NBFD15 (HOYA catalog equivalent; production supplier unspecified) |
| E13 | Meniscus Negative | S-LAH55V (OHARA catalog equivalent; production supplier unspecified) |
| E14 | Biconvex Positive | S-FPL51 (OHARA catalog equivalent; production supplier unspecified) |
| E15 | Biconvex Positive (Asph) | L-BAL42 (OHARA catalog equivalent; production supplier unspecified) |
| E16 | Meniscus Negative | S-LAH55V (OHARA catalog equivalent; production supplier unspecified) |