US 4,560,253 Embodiment 2 — Minolta / Ogino
| 6 components / 6 air-spaced groups |
| 7 modeled optical media including hybrid resin layer |
| 36.0-68.2 mm patent design range |
| FNO 4.1 patent design aperture |
| 1 hybrid aspherical surface |
Front-group focus. The patent states that Group I alone shifts during focusing; close-focus spacings are paraxial estimates because the patent publishes no close-focus table.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | LAF2 / N-LAF2 / S-LAM2 class (744/449) |
| L2g | Positive Meniscus | E-FD1L / N-SF1 / S-TIH1 class (717/295; patent νd = 29.42) |
| L2r | Aspherical Resin Layer | UV-curing acrylic resin (patent thin transparent layer) |
| L3 | Biconvex Positive | 670571 - lanthanum crown (historic catalog match unresolved) |
| L4 | Positive Meniscus | 670571 - lanthanum crown (historic catalog match unresolved) |
| L5 | Biconcave Negative | 750251 - dense/fluor flint (catalog unresolved) |
| L6 | Biconvex Positive | E-FD5 / N-SF5 / S-TIM25 class (673/322) |
Detailed analysis available in the interactive viewer above.