| FoM APS-C WC | FoM 35mm WC | FoM APS-C AC | FoM 35mm AC | FoM APS-C BC | FoM 35mm BC | |||
| EF 300mm f4L IS USM + 1.4X | 75% | 47% | 96% | 77% | 100% | 100% | ||
| EF 100-400mm f4.5-5.6L IS USM 400 mm (Est) | 76% | 47% | 100% | 88% | 100% | 100% | ||
| EF 70-200mm f4L USM 2X 400 mm (Est) | 78% | 43% | 100% | 84% | 100% | 100% | ||
| EF 70-200mm f2.8L USM 2X 400 mm (Est) | 73% | 40% | 100% | 84% | 100% | 100% | ||
| EF 70-200mm f2.8L IS USM 2X 400 mm (Est) | 67% | 34% | 82% | 66% | 100% | 100% | ||
| EF 400mm f5.6L USM | 100% | 85% | 100% | 99% | 100% | 100% | ||
| #N/A | #N/A | #N/A | #N/A | #N/A | #N/A | #N/A | ||
| #N/A | #N/A | #N/A | #N/A | #N/A | #N/A | #N/A | ||