US 3,736,049, sole example — Yoshiyuki Shimizu
| 9 ELEMENTS / 8 GROUPS |
| f ≈ 27.8 mm (design) |
| F/2.0 |
| 2ω ≈ 74.5° |
| ALL SPHERICAL |
CRC (Close-Range Correction): the converter-to-master gap d9 closes by the published 0.616 mm at β = −1/10 (≈0.37 m) while the whole lens extends; the 0.3 m production MFD keyframe holds that d9 and is calculated.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-BSM15 (catalog-compatible spectral proxy; patent 1.62299/58.1, catalog 1.622992/58.165763; production supplier unspecified) |
| L2 | Positive Meniscus | S-LAM2 (catalog-compatible spectral proxy; patent 1.744/44.9, catalog 1.743997/44.79; production supplier unspecified) |
| L3 | Negative Meniscus | S-BSM15 (catalog-compatible spectral proxy; patent 1.62299/58.1, catalog 1.622992/58.165763; production supplier unspecified) |
| L4 | Biconvex Positive | J-LASF016 (catalog-compatible spectral proxy; patent 1.7725/49.5, catalog 1.7725/49.62; production supplier unspecified) |
| L5 | Biconcave Negative | J-BK7A (catalog-compatible spectral proxy; patent 1.5168/64.2, catalog 1.5168/64.14; production supplier unspecified) |
| L6 | Biconvex Positive | J-BK7A (catalog-compatible spectral proxy; patent 1.5168/64.2, catalog 1.5168/64.14; production supplier unspecified) |
| L7 | Biconcave Negative | SF56A (catalog-compatible spectral proxy; patent 1.7847/26.1, catalog 1.7847/26.08; production supplier unspecified) |
| L8 | Positive Meniscus | 744479 — lanthanum flint (catalog unresolved; nd = 1.74443, νd = 47.9) |
| L9 | Biconvex Positive | S-LAL8 (catalog-compatible spectral proxy; patent 1.713/53.9, catalog 1.712995/53.87; production supplier unspecified) |