JP 2019-191502 A — Naoyuki Sato
| 9 ELEMENTS / 8 GROUPS |
| DESIGN f = 41.19 mm |
| DESIGN F/2.08 |
| 2ω = 54.9° |
| 6 ASPHERICAL SURFACES / 3 ELEMENTS |
PUBLISHED inner focus: L2 (E3-E4) and L4 (E6) move toward the object by 3.5169 and 4.3500 mm between the patent's infinity and close endpoints; L1, the stop, L3 and L5 stay fixed. At the close endpoint the object is 134.5124 mm ahead of the first vertex, 0.2349601 m from the image plane. Intermediate positions are interpolated, not a measured production cam. Source image-plane offsets from Gaussian focus are retained.
| Element | Type | Glass |
|---|---|---|
| E1 | Biconcave Negative (2× Asph) | FCD1 (HOYA; catalog ne 1.49845, vd 81.61 as printed; supplier unconfirmed) |
| E2 | Biconvex Positive | Unmatched (printed coordinates; no vendor row at either the d or the e line) |
| E3 | Negative Meniscus | FDS90-SG (HOYA; catalog ne 1.85505, vd 23.78 as printed; supplier unconfirmed) |
| E4 | Biconvex Positive (2× Asph) | M-PCD51 (HOYA; catalog ne 1.59412, vd 67.02 as printed; supplier unconfirmed) |
| E5 | Negative Meniscus | Unmatched (printed coordinates; no vendor row at either the d or the e line) |
| E6 | Biconvex Positive (2× Asph) | M-FCD1 (HOYA; catalog ne 1.49856, vd 81.56 as printed; supplier unconfirmed) |
| E7 | Positive Meniscus | S-NBH56 (OHARA; catalog ne 1.86290, vd 24.80 as printed; supplier unconfirmed) |
| E8 | Negative Meniscus | Unmatched (printed coordinates; no vendor row at either the d or the e line) |
| E9 | Negative Meniscus | Unmatched (printed coordinates; no vendor row at either the d or the e line) |