US 4,251,133 Example 3 — Canon / Tsuji
| 6 elements / 6 groups |
| f ≈ 299.5 mm |
| F/4 |
| 2ω ≈ 8.25° |
| all-spherical |
| rear focusing |
Internal rear focusing by imageward translation of the L5+L6 negative sub-group.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | S-FSL5 (OHARA) |
| L2 | Negative Meniscus | S-TIH18 (OHARA) |
| L3 | Positive Meniscus | S-FSL5 (OHARA) |
| L4 | Negative Meniscus | S-BAL35 (OHARA) |
| L5 | Biconvex Positive | S-FTM16 (OHARA) |
| L6 | Negative Meniscus | S-LAH66 (OHARA) |
Detailed analysis available in the interactive viewer above.