US 2010/0194930 A1 — Kyoichi Miyazaki, Keiichi Zaitsu
| 16 elements / 12 groups |
| 7.2006-13.6229 mm patent EFL |
| f/4 constant-aperture Micro Four Thirds zoom |
| 2 aspherical surfaces |
| 4 ED-class elements |
| 0.25 m close focus |
Internal rear focus by G4/L14 moving image-side. Close-focus spacings are paraxially solved for 0.25 m because the patent publishes infinity zoom spacings only.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | Lanthanum flint class (804/465, catalog match uncertain) |
| L2 | Negative Meniscus | Lanthanum flint class (804/465, catalog match uncertain) |
| L3 | Negative Meniscus (1x Asph) | High-index lanthanum flint class (808/409, catalog match uncertain) |
| L4 | Biconcave Negative | S-FPL51 / FCD1 class (ED fluorophosphate crown) |
| L5 | Positive Meniscus | Dense lanthanum flint class (806/333, NBFD15/H-ZLaF56 class) |
| L6 | Negative Meniscus | Lanthanum flint class (743/492, S-LAM60/H-LaF53/NBF1 class) |
| L7 | Positive Meniscus | Dense flint class (673/322, E-FD5/SF5 class) |
| L8 | Negative Meniscus | S-TIH53 (OHARA) |
| L9 | Biconvex Positive | N-BK7 / S-BSL7 class (borosilicate crown) |
| L10 | Biconcave Negative | N-BK7 / S-BSL7 class (borosilicate crown) |
| L11 | Biconvex Positive | S-FPL51 / FCD1 class (ED fluorophosphate crown) |
| L12 | Positive Meniscus | S-FPL51 / FCD1 class (ED fluorophosphate crown) |
| L13 | Biconvex Positive | S-FPL51 / FCD1 class (ED fluorophosphate crown) |
| L14 | Negative Meniscus | S-NSL3 (OHARA) |
| L15 | Negative Meniscus | S-TIH6 / N-SF6 class (OHARA/Schott dense flint) |
| L16 | Biconvex Positive (1x Asph) | Unmatched crown class (523/701, likely phosphate/fluorophosphate) |