US 2014/0071333 A1 — Fumikazu Kanetaka, Hisashi Uno
| 8 ELEMENTS / 7 GROUPS |
| 4 FUNCTIONAL GROUPS |
| f ≈ 34.03 mm |
| F/2.05 DESIGN |
| 2ω = 64.96° |
| 5 ASPHERICAL SURFACES |
Published double-floating focus: GR2 (with STO) and GR3 move independently objectward while GR1 and GR4 remain fixed; infinity, intermediate, and shortest source states are preserved.
| Element | Type | Glass |
|---|---|---|
| G1 | Negative Meniscus | 517-642 / BSC7 class (supplier unconfirmed) |
| G2 | Biconcave Negative | 805-255 / FD60 class (supplier unconfirmed) |
| G3 | Biconvex Positive (2× Asph) | 882-372 / M-TAFD307 class (supplier unconfirmed) |
| G4 | Biconcave Negative | 923-209 / E-FDS1 class (supplier unconfirmed) |
| G5 | Biconvex Positive (1× Asph) | 882-372 / M-TAFD307 class (supplier unconfirmed) |
| G6 | Biconvex Positive | 001-291 / TAFD55-W / S-LAH99 class (supplier unconfirmed) |
| G7 | Biconcave Negative (2× Asph) | 583-595 / M-BACD12 class (supplier unconfirmed) |
| G8 | Plano-Convex Positive | 904-313 lanthanum-flint class (TAFD25L / S-LAH95 near match; supplier unconfirmed) |