CN 120276109 A — Dayong Li
| 12 ELEMENTS / 9 GROUPS |
| DESIGN f = 174.92 mm |
| DESIGN F/4.6 |
| MF AND AF FOCUS CONFIGURATIONS |
MF configuration, from the patent's MF table: infinity and two published close stations at -1.0x and -1.5x. G2 and the stop move together toward the object, 31.05 mm in total; G1 and G3 stay fixed. Calculated paraxial object-to-image distances at the two stations are 355.098678 mm and 304.755369 mm; the slider scale uses these calculated distances, not the marketed 0.30 m MF or 1.5 m original AF limits. Between the three published states the spacings are interpolated for display only: this is not a published cam law, and distance labels between stations can differ from the physical conjugates. The combined MF-plus-AF use of the production lens is not modeled, and the launch and effective-f-number readouts at close focus are approximate.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | Unmatched (crown, native 1.6180/68.00) |
| L2 | Biconvex Positive | FCD1 (HOYA, coordinate equivalent) |
| L3 | Positive Meniscus | FCD1 (HOYA, coordinate equivalent) |
| L4 | Biconcave Negative | FD60 (HOYA, coordinate equivalent) |
| L5 | Positive Meniscus | E-FDS1 (HOYA, coordinate equivalent) |
| L6 | Negative Meniscus | TAFD25 (HOYA, near coordinate equivalent) |
| L7 | Biconvex Positive | E-F5 (HOYA, coordinate equivalent) |
| L8 | Negative Meniscus | Unmatched (high-index crown, native 1.8830/45.80) |
| L9 | Biconvex Positive | H-ZF13 (CDGM, coordinate equivalent) |
| L10 | Biconcave Negative | LAC14 (HOYA, coordinate equivalent) |
| L11 | Negative Meniscus | Unmatched (crown, native 1.7292/58.67) |
| L12 | Biconvex Positive | E-FEL1 (HOYA, coordinate equivalent) |