US 8,508,864 B2 — Iain A. Neil
| 13 ELEMENTS / 10 AIR-SPACED GROUPS |
| 3 FUNCTIONAL GROUPS (G1a / G1b / G2) |
| MARKETED 100 mm / T1.4 |
| MODELED f/1.3976 AT F1 (d-line) |
| 2 ASPHERICAL SURFACES |
| 28 mm PATENT IMAGE DIAGONAL |
Published three-state floating focus: G1a fixed; G1b and G2 move independently but coordinately toward object space for closer focus. Table 5 gives F3 as 0.696 m from S0 to S1; after adding the 0.193248 m S1-to-image track, closeFocusM = 0.889248 m is the patent F3 object-to-image distance used by the focus control, not the marketed 0.99 m production MFD.
| Element | Type | Glass |
|---|---|---|
| L2 | Biconvex Positive | S-FPL51 (OHARA) |
| L3 | Biconvex Positive | S-LAM2 (OHARA) |
| L4 | Biconcave Negative (1× Asph) | S-NBM51 (OHARA) |
| L5 | Biconcave Negative | S-NBM51 (OHARA) |
| L6 | Positive Meniscus | S-LAM55 (OHARA) |
| L7 | Negative Meniscus | S-NBH8 (OHARA) |
| L8 | Biconvex Positive | S-FPL51 (OHARA) |
| L9 | Positive Meniscus | S-FPL53 (OHARA) |
| L10 | Positive Meniscus | S-NPH1 (OHARA) |
| L11 | Positive Meniscus | S-FPL53 (OHARA) |
| L12 | Biconcave Negative (1× Asph) | S-NBH8 (OHARA) |
| L13 | Positive Meniscus | S-NPH1 (OHARA) |
| L14 | Biconvex Positive | S-LAH65V (OHARA) |