CN 112285890 B — Dayong Li
| 13 ELEMENTS / 9 GROUPS |
| DESIGN f = 44.89 mm |
| DESIGN F/0.98 |
| 2 ASPHERICAL SURFACES / 1 ELEMENT |
PUBLISHED gap sets for infinity and for a 2500 mm object distance, the only two states the patent tabulates; the model places that object 2497 mm in front of the first surface. G1 is fixed. G2 (auxiliary) and G3 (main) move toward the object independently, by 2.25 mm and 0.91 mm at the near state, and the stop rides with G3; overall length is constant. The 2.62 m near limit is that state's paraxial object-to-image distance, not the marketed 0.5 m minimum focus. Intermediate positions and distance labels are linear interpolations, not a published cam.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | H-FK61 (CDGM, coordinate equivalent; supplier unconfirmed) |
| L2 | Positive Meniscus | Unmatched (nd 1.88421, vd 37.00; no close catalog match) |
| L3 | Positive Meniscus | TAFD30 (HOYA, coordinate equivalent; supplier unconfirmed) |
| L4 | Positive Meniscus | E-FDS1 (HOYA, coordinate equivalent; supplier unconfirmed) |
| L5 | Biconcave Negative | Unmatched (nd 1.69660, vd 28.87; no close catalog match) |
| L6 | Biconcave Negative | Unmatched (nd 1.64465, vd 33.02; no close catalog match) |
| L7 | Biconvex Positive | Unmatched (nd 1.83098, vd 46.00; no close catalog match) |
| L8 | Biconvex Positive | H-FK61 (CDGM, coordinate equivalent; supplier unconfirmed) |
| L9 | Biconcave Negative | E-F2 (HOYA, coordinate equivalent; supplier unconfirmed) |
| L10 | Positive Meniscus | TAFD30 (HOYA, coordinate equivalent; supplier unconfirmed) |
| L11 | Biconvex Positive | TAFD30 (HOYA, coordinate equivalent; supplier unconfirmed) |
| L12 | Biconcave Negative | Unmatched (nd 1.64079, vd 33.41; no close catalog match) |
| L13 | Negative Meniscus (2x Asph) | TAFD30 (HOYA, coordinate equivalent; supplier unconfirmed) |