JP 2020-173349 A — Maki Yokoya, Tomohiro Ino
| 11 ELEMENTS / 8 GROUPS |
| 800mm f/11 (MARKETED) |
| f = 776.37 mm / F/11.31 (PATENT) |
| 2ω = 3.20° |
| S4 DIFFRACTIVE PHASE SURFACE |
| OBJECTWARD SINGLE-ELEMENT INNER FOCUS |
CONSTRAINED_RECONSTRUCTION: the patent infinity row conflicts with its own cardinal data. The modeled infinity state conserves d7+d9 = 57.33 mm and solves the single L2 translation for EFL = 776.37 mm (d7 = 38.42721463001324 mm, d9 = 18.90278536998676 mm). L2 moves objectward toward close focus. The published near row 21.25/36.08 mm is retained and traces to about 6.014 m from the image plane; Canon specifies a 6.0 m production MFD.
| Element | Type | Glass |
|---|---|---|
| E1 | Positive Meniscus | 487702 patent coordinate; S-FSL5 catalog spectral proxy (production supplier unspecified) |
| E2 | Biconvex Positive | 487702 patent coordinate; S-FSL5 catalog spectral proxy (production supplier unspecified) |
| E3 | Biconcave Negative | 744448 patent coordinate; J-LAF2 catalog spectral proxy (production supplier unspecified) |
| E4 | Negative Meniscus | 697555 patent coordinate; J-LAK14 catalog spectral proxy (production supplier unspecified) |
| E5 | Positive Meniscus | 487702 patent coordinate; S-FSL5 catalog spectral proxy (production supplier unspecified) |
| E6 | Biconcave Negative | 900374 patent coordinate; TAFD37A catalog spectral proxy (production supplier unspecified) |
| E7 | Biconvex Positive | 654397 patent coordinate; N-KZFS5 catalog spectral proxy (production supplier unspecified) |
| E8 | Biconvex Positive | 654397 patent coordinate; N-KZFS5 catalog spectral proxy (production supplier unspecified) |
| E9 | Biconcave Negative | 593686 patent coordinate; FCD515 catalog spectral proxy (production supplier unspecified) |
| E10 | Biconcave Negative | 804465 patent coordinate; TAF3D catalog spectral proxy (production supplier unspecified) |
| E11 | Biconvex Positive | 596392 patent coordinate; E-F8 catalog spectral proxy (production supplier unspecified) |