US 7,715,116 B2, Embodiment 7 — Koji Kato
| 8 ELEMENTS / 6 GROUPS |
| DESIGN f = 291.00 mm |
| DESIGN F/4.1 |
| ALL SPHERICAL |
| 2 ED ELEMENTS |
PUBLISHED inner focus: the cemented negative third group (surfaces 10–12) moves 11.29 mm toward the image while the stop stays fixed with the second group. Table 7 prints both end spacings; the stop's own gap is derived from printed d9, and positions between the ends are interpolated. Traced at the closest spacing, object to image is 1400 mm at m = −0.2445, where Table 7 prints −0.25 and Ricoh lists 1.4 m and 0.24×.
| Element | Type | Glass |
|---|---|---|
| L11 | Positive Meniscus | S-FSL5 (OHARA catalog equivalent; production supplier unspecified) |
| L12 | Biconvex Positive | S-FPL53 (OHARA catalog equivalent; production supplier unspecified) |
| L13 | Biconcave Negative | Unmatched (lanthanum flint; patent 1.80000/44.1 is a design value with no catalog row) |
| L21 | Negative Meniscus | Unmatched (lanthanum flint; patent 1.79952/41.3 is a design value with no catalog row) |
| L22 | Positive Meniscus | FCD1 (HOYA catalog equivalent; production supplier unspecified) |
| L31 | Biconvex Positive | S-TIH6 (OHARA catalog equivalent; production supplier unspecified) |
| L32 | Biconcave Negative | Unmatched (lanthanum flint; patent 1.74260/44.4 is a design value with no catalog row) |
| L41 | Positive Meniscus | Unmatched (dense flint; patent 1.69883/29.6 is a design value with no catalog row) |