US 2016/0313535 A1 — Numerical Example 1
| Canon EF-M / APS-C |
| Patent f = 27.74 mm; recomputed f = 27.76 mm |
| F/3.61 design; f/3.5 marketed |
| 10 powered elements / 9 powered groups (+ folded cover plate) |
| 3 aspherical surfaces on 2 elements; 1 UD-class element |
| Rear-focus L2 cemented doublet; two-mode macro patent mechanism |
Patent rear-focus mechanism: L2 cemented doublet moves imageward within each focus mode; L1 and L2 shift objectward for the Super Macro mode. This file interpolates from infinity to the 1.2× third finite state and folds the patent cover plate into final BF.
| Element | Type | Glass |
|---|---|---|
| 101 | Biconcave Negative (1× Asph) | S-BAL42 (OHARA) |
| 102 | Biconvex Positive | S-TIH6 (OHARA) |
| 103 | Positive Meniscus | S-LAH66 (OHARA) |
| 104 | Biconcave Negative | S-LAH98 (OHARA) |
| 105 | Biconvex Positive | S-NSL3 (OHARA) |
| 106 | Negative Meniscus | S-LAH95 (OHARA) |
| 107 | Biconvex Positive | S-FPL51 (OHARA) |
| 108 | Biconvex Positive (2× Asph) | S-BAL42 (OHARA) |
| 109a | Positive Meniscus | S-NPH3 (OHARA) |
| 109b | Negative Meniscus | S-LAH55V (OHARA) |
Detailed analysis available in the interactive viewer above.