JP 2011-48232 A — Koji Hoshi, Kyoichi Miyazaki, Noriyuki Adachi
| 14 ELEMENTS / 10 GROUPS |
| 1 ASPHERICAL ELEMENT / 1 ED ELEMENT |
| PUBLISHED INFINITY / 0.5× / 1× SPACINGS |
The patent gives infinity, 0.5× and 1× prescriptions. For closer focus, G2 moves toward the image and G4/G5 toward the object. Distances are calculated for this prescription, rather than taken from the production lens's 0.15 m minimum. Intermediate spacings are interpolated. The iris stays at its infinity setting, so finite-focus apertures differ from the patent's tabulated values. Optical stabilization remains centered.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | H-K9L (CDGM spectral proxy for 517642; supplier unconfirmed) |
| L2 | Negative Meniscus | N-SF66 (Schott spectral proxy for 923209; supplier unconfirmed) |
| L3 | Biconvex Positive (1× Asph) | MC-TAF101-100 (HOYA spectral proxy; source 1.76930/49.3 retained; supplier and melt unconfirmed) |
| L4 | Plano-Concave | K-LaSFn23 (Sumita spectral proxy for 911352; supplier unconfirmed) |
| L5 | Biconcave Negative | K-LaSFn23 (Sumita spectral proxy for 911352; supplier unconfirmed) |
| L6 | Positive Meniscus | FDS18 (Hoya spectral proxy for 946180; supplier unconfirmed) |
| L7 | Biconvex Positive | TAC8 (Hoya spectral proxy for 729547; supplier unconfirmed) |
| L8 | Biconvex Positive | E-LASF016 (Hikari spectral proxy for 772496; supplier unconfirmed) |
| L9 | Negative Meniscus | J-SF03 (Hikari spectral proxy for 847238; supplier unconfirmed) |
| L10 | Biconvex Positive | TAC8 (Hoya spectral proxy for 729547; supplier unconfirmed) |
| L11 | Biconvex Positive | H-FK61 (CDGM spectral proxy for 497816; supplier unconfirmed) |
| L12 | Biconcave Negative | N-FK5 (Schott spectral proxy for 487704; supplier unconfirmed) |
| L13 | Biconcave Negative | N-FK5 (Schott spectral proxy for 487704; supplier unconfirmed) |
| L14 | Biconvex Positive | J-LASF05 (Hikari spectral proxy for 835427; supplier unconfirmed) |