US 2018/0149842 A1 Example 1 - Anhui Changgeng Optics / Xiaohua Zhang
| Patent Example 1 |
| 12 elements / 9 groups |
| f = 15.505 mm design |
| F/2.06 design; f/2 marketed |
| 2ω = 109.4° patent field |
| 4 aspherical surfaces on 2 elements |
Patent rear/inner focus: Gr1 fixed; the stop plus Gr2 translate objectward by 0.298 mm at the patent 0.020x state. The production 0.15 m / 0.25x close-focus spacing is not published in the patent and is not extrapolated here.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | TAC8 / S-LAL18 / H-LaK52 class (729-547) |
| L2 | Neg. Meniscus (2x Asph) | M-NBFD130 / NBFD13 class (806-407) |
| L3 | Negative Meniscus | FD60 / N-SF6 class (805-255) |
| L4 | Biconvex Positive | TAFD35L / TAFD35 class (911-353) |
| L5 | Biconcave Negative | FCD1 / N-PK52A / S-FPL51 class (497-816) |
| L6 | Biconvex Positive | E-F2 / N-F2 class (620-363) |
| L7 | Biconcave Negative | NBFD15 / NBFD15-W class (806-333) |
| L8 | Negative Meniscus | TAFD25 / N-LASF46B class (904-313) |
| L9 | Biconvex Positive | FCD1 / N-PK52A / S-FPL51 class (497-816) |
| L10 | Negative Meniscus | TAFD5G class (835-427) |
| L11 | Biconvex Positive | FCD1 / N-PK52A / S-FPL51 class (497-816) |
| L12 | Neg. Meniscus (2x Asph) | M-BACD12 / L-BAL42 / D-ZK2 class (583-595) |
Detailed analysis available in the interactive viewer above.