US 8,854,747 B2 Example 1 — Canon / Shunji Iwamoto
| 7 elements / 6 groups |
| f = 21.79 mm design / 22 mm marketed |
| F2.05 design / f/2 marketed |
| image height 13.66 mm |
| 2 aspherical surfaces on one element |
Patent-tabulated two-gap inner/floating focus from infinity to beta = -0.1x; production 0.15 m MFD is not extrapolated.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconcave Negative | S-NSL36 (OHARA, 517524) |
| L12 | Biconvex Positive | S-LAH55V (OHARA, 835427) |
| L21p | Biconvex Positive | S-LAH58 (OHARA, 883408) |
| L21n | Biconcave Negative | S-TIH11 (OHARA, 785257) |
| L22 | Negative Meniscus | S-TIM1 (OHARA, 626357, non-recommended) |
| L23 | Biconvex Positive | S-LAH58 (OHARA, 883408) |
| L24 | Pos. Meniscus (2× Asph) | S-BAL42 / L-BAL42 (OHARA, 583594) |
Detailed analysis available in the interactive viewer above.