JP 2013-104994 A — Numerical Example 2
| 19 elements / 14 groups |
| 180 mm f/2.8 marketed; 174.60 mm f/2.92 design |
| 0.47 m MFD / 1:1 macro |
| Optical Stabilizer; floating internal focus |
| 3 FLD-class elements; all-spherical |
Floating internal focus: L2 moves imageward while L3 moves objectward; L1, L4, L5/OS, and L6 remain fixed relative to the image plane.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive | BK7 / S-BSL7 class borosilicate crown |
| L12 | Biconvex Positive | FCD100 / S-FPL53 class fluorite-like ED glass (Sigma FLD) |
| L13 | Positive Meniscus | FCD100 / S-FPL53 class fluorite-like ED glass (Sigma FLD) |
| L14 | Biconvex Positive | PCD51 class low-dispersion crown |
| L15 | Biconcave Negative | M-NBFD130 class dense lanthanum flint |
| L21 | Negative Meniscus | N-LAF34 / TAF1 class lanthanum dense flint |
| L22 | Plano-Convex | SF6 / S-TIH6 class dense flint |
| L23 | Biconcave Negative | E-C3 / S-NSL3 class light crown |
| L31 | Positive Meniscus | S-LAL18 / TAC8 class lanthanum crown |
| L32 | Negative Meniscus | NBFD15 / H-ZLaF56B class dense lanthanum flint |
| L33 | Biconvex Positive | FCD100 / S-FPL53 class fluorite-like ED glass (Sigma FLD) |
| L41 | Biconcave Negative | SF6 / S-TIH6 class dense flint |
| L42 | Biconvex Positive | SF6 / S-TIH6 class dense flint |
| L51 | Negative Meniscus | N-SK16 / BACD16 class dense barium crown |
| L52 | Positive Meniscus | SF6 / S-TIH6 class dense flint |
| L53 | Biconcave Negative | S-BAL35 / M-BACD5N class barium crown |
| L61 | Positive Meniscus | N-SK16 / BACD16 class dense barium crown |
| L62 | Negative Meniscus | N-SF57 / S-TIH53 class dense flint |
| L63 | Biconvex Positive | M-NBFD130 class dense lanthanum flint |
Detailed analysis available in the interactive viewer above.