JP 2010-217838 A, Example 1 — Tomoki Kono
| 16 ELEMENTS / 11 GROUPS |
| DESIGN f = 70.33-290.5 mm |
| DESIGN F/4.15-5.84 |
| ALL SPHERICAL |
| 1 SLD ELEMENT |
PUBLISHED front-group focus: group L1 moves objectward, D5 widening to the printed 13.9067, 41.2722 and 60.2419 mm at 70.33, 147.08 and 290.5 mm for object distances of 2945.7, 5998.33 and 11779.36 mm from the first surface. Travel to Sigma's 1.5 m minimum focus (up to 16.6 mm) and the intermediate-zoom back focus are derived paraxially, not factory cam data; the printed states are not the minimum focus. The patent's small finite/infinity back-focus rounding differences are kept. The OS group is modelled centred.
| Element | Type | Glass |
|---|---|---|
| E1 | Positive Meniscus | H-QK3L (CDGM equivalent) |
| E2 | Negative Meniscus | NBFD13 (Hoya equivalent) |
| E3 | Positive Meniscus | FCD1 (Hoya equivalent) |
| E4 | Biconcave Negative | LAC8 (Hoya equivalent) |
| E5 | Positive Meniscus | FDS90 (Hoya equivalent) |
| E6 | Biconcave Negative | N-LAF34 (Schott equivalent) |
| E7 | Biconvex Positive | E-F5 (Hoya equivalent) |
| E8 | Biconvex Positive | H-K9L (CDGM equivalent) |
| E9 | Biconcave Negative | NBFD15 (Hoya equivalent) |
| E10 | Positive Meniscus | E-CF6 (Hoya equivalent) |
| E11 | Biconvex Positive | H-QK3L (CDGM equivalent) |
| E12 | Biconvex Positive | H-QK3L (CDGM equivalent) |
| E13 | Biconcave Negative | E-LAF7 (Hoya equivalent) |
| E14 | Biconvex Positive | E-FD1L (Hoya equivalent) |
| E15 | Positive Meniscus | FDS90 (Hoya equivalent) |
| E16 | Negative Meniscus | N-LAF34 (Schott equivalent) |