JP 2025-063175 A, Example 4 — Riki Maruyama
| 23 ELEMENTS / 17 GROUPS |
| DESIGN f = 581.97 mm |
| DESIGN F/4.12 |
| ALL SPHERICAL |
PUBLISHED inner focus: the cemented GR2 doublet moves 19.47 mm toward the object while GR1, GR3 and the image plane stay fixed. Table 12 prints d14 51.20 → 31.73 mm and d17 9.54 → 29.00 mm for the 4.5 m state, measured object to image, which matches the marketed 4.5 m minimum focus.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive | S-FTM16 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L12 | Biconvex Positive | CaF2 optical fluorite crystal (supplier unconfirmed) |
| L13 | Biconcave Negative | S-NBH56 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L14 | Biconvex Positive | CaF2 optical fluorite crystal (supplier unconfirmed) |
| L15 | Biconcave Negative | S-NBH56 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L16 | Positive Meniscus | FCD100 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L17 | Negative Meniscus | H-K9L (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L21 | Biconvex Positive | S-FTM16 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L22 | Biconcave Negative | H-K9L (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L31 | Biconvex Positive | S-TIH1 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L32 | Biconcave Negative | H-QK3L (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L33 | Biconvex Positive | S-NBH56 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L34 | Biconcave Negative | FCD1 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L35 | Biconcave Negative | J-LASF016 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L36 | Positive Meniscus | E-FL5 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L37 | Biconvex Positive | E-FL5 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L38 | Biconcave Negative | TAFD45 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L39 | Biconvex Positive | S-FTM16 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L40 | Biconcave Negative | FCD515 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L41 | Positive Meniscus | E-FD8 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L42 | Biconvex Positive | S-NBH8 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L43 | Negative Meniscus | E-FDS1 (coordinate-compatible spectral proxy; supplier unconfirmed) |
| L44 | Negative Meniscus | E-FDS1 (coordinate-compatible spectral proxy; supplier unconfirmed) |