US 8,767,310 B2, Numeral Example 1-2 — Yasuji Ogata, Yasuharu Yamada, Toshio Takahashi, Toyoki Kon
| 13 ELEMENTS / 10 GROUPS |
| DESIGN f = 40.80–147.00 mm |
| DESIGN F/4.08–5.91 |
| ALL SPHERICAL |
| 1 ED, 1 HR ELEMENT (MAKER) |
G4 moves toward the image for closer focus; G1, G2 and G3 do not move. The patent plots aberrations at 0.9 m but prints no close-focus spacings, so the travel is calculated for a 0.9 m object-to-image distance: 1.40 / 3.80 / 6.38 mm at the wide, middle and telephoto positions. These positions reproduce the f-numbers printed in Fig. 7 to within 0.001, and 0.9 m is the marketed minimum focus distance. Distance labels are approximate, by up to about 6.5% at far focus, and finite-conjugate MTF is unavailable.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | S-BSL7 (OHARA catalog equivalent; production supplier unspecified) |
| L2 | Negative Meniscus | S-TIH6 (OHARA catalog equivalent; production supplier unspecified) |
| L3 | Negative Meniscus | S-LAL18 (OHARA catalog equivalent; production supplier unspecified) |
| L4 | Positive Meniscus | S-NPH1 (OHARA catalog equivalent; production supplier unspecified) |
| L5 | Negative Meniscus | S-LAH66 (OHARA catalog equivalent; production supplier unspecified) |
| L6 | Biconvex Positive | S-FPL51 (OHARA catalog equivalent; production supplier unspecified) |
| L7 | Biconvex Positive | S-FSL5 (OHARA catalog equivalent; production supplier unspecified) |
| L8 | Biconcave Negative | TAFD25 (HOYA, coordinate equivalent) |
| L9 | Biconcave Negative | S-BAH28 (OHARA catalog equivalent; production supplier unspecified) |
| L10 | Biconvex Positive | S-BSM14 (OHARA catalog equivalent; production supplier unspecified) |
| L11 | Biconvex Positive | S-LAH66 (OHARA catalog equivalent; production supplier unspecified) |
| L12 | Positive Meniscus | S-TIM25 (OHARA catalog equivalent; production supplier unspecified) |
| L13 | Biconcave Negative | S-LAL61 (OHARA catalog equivalent; production supplier unspecified) |