JP 1991-141313 — Hideki Ogawa
| 10 ELEMENTS / 9 GROUPS |
| 100mm f/2.8 (marketed) |
| F/2.89 DESIGN |
| 1.0× MACRO |
| 0.31 m MFD (marketed) |
PUBLISHED — Groups I + II and the diaphragm translate toward the object while Group III and the image plane remain fixed. In R1-normalized coordinates only D14 changes: 2.50 mm at infinity, 25.62 mm at 0.5×, and 48.74 mm at 1.0×. The modeled 1× subject-to-image distance is 0.30687 m; Canon markets 0.31 m.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | 603607 — d-line coordinate class (historical vendor unresolved) |
| L2 | Positive Meniscus | 786442 — d-line coordinate class (historical vendor unresolved) |
| L3 | Positive Meniscus | 786442 — d-line coordinate class (historical vendor unresolved) |
| L4 | Negative Meniscus | 805254 — d-line coordinate class (historical vendor unresolved) |
| L5 | Negative Meniscus | 699301 — d-line coordinate class (historical vendor unresolved) |
| L6 | Positive Meniscus | 806409 — d-line coordinate class (historical vendor unresolved) |
| L7 | Biconvex Positive | 786442 — d-line coordinate class (historical vendor unresolved) |
| L8 | Biconvex Positive | 805254 — d-line coordinate class (historical vendor unresolved) |
| L9 | Biconcave Negative | 762401 — d-line coordinate class (historical vendor unresolved) |
| L10 | Positive Meniscus | 516641 — d-line coordinate class (historical vendor unresolved) |