CN 104991330 B — Xiaohua Zhang
| 11 ELEMENTS / 8 GROUPS |
| DESIGN f = 102.26 mm |
| DESIGN F/2.05 |
| ALL SPHERICAL |
| APODIZATION ELEMENT |
PUBLISHED infinity and 0.15× states from CN 104991330 B Example 1 (D11 13.5722 → 7.0000 mm, D22 39.6422 → 55.5496 mm). Both positive groups move toward the object, Gr1 by 9.34 mm and Gr2 by 15.91 mm, closing the air space between them by 6.57 mm. The 0.855 m object-to-image distance of the 0.15× state is calculated from those spacings; the patent does not print it, and it is not the marketed 0.9 m minimum focus distance. Positions between the two states are linearly interpolated.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | FC5 (HOYA; coordinate equivalent) |
| L2 | Positive Meniscus | E-FDS1 (HOYA; coordinate equivalent) |
| L3 | Negative Meniscus | Unmatched (flint; source nd 1.69449, vd 29.84) |
| L4 | Positive Meniscus | TAF3 (HOYA; coordinate equivalent) |
| L5 | Biconvex Positive | Unmatched (crown; source nd 1.55102, vd 66.41) |
| L6 | Biconcave Negative | SF11 (Schott; coordinate equivalent) |
| L7 | Biconvex Positive | TAF3 (HOYA; coordinate equivalent) |
| L8 | Plano-Concave | Unmatched (neutral-gray apodization glass; source nd 1.50400, vd 63.00) |
| L9 | Plano-Convex | Unmatched (crown; source nd 1.67128, vd 56.37) |
| L10 | Biconcave Negative | E-F2 (HOYA; coordinate equivalent) |
| L11 | Biconvex Positive | Unmatched (high-index glass; source nd 1.81538, vd 36.87) |