Snap the lens's built-in Extender into place, and the test results are still very good indeed. Sharpness isn't quite so high, but there's nothing at all to complain about in the other tests.
| Sharpness | Sharpness drops a little with the extender in place, but is still pretty high when shooting wide open at F5.6. The best results are obtained at F8; with only a little softening at F11. As expected diffraction takes a huge toll at F45, but this isn't exactly an everyday setting on a supertelephoto lens. |
|---|---|
| Chromatic Aberration | Lateral chromatic aberration is slightly increased, but in practical terms still very low. There's a little red/cyan fringing towards the edge of the frame at the long end, but it's unlikely ever to be a problem. |
| Vignetting | Vignetting is again negligible. |
| Distortion | Distortion increases measurably with the Extender in place, but in practical terms this means going from nonexistent to insignificant. |
Canon EF 200-400mm f/4L IS USM Extender 1.4x | $11,799.00 |
Canon EF 200-400mm f/4L IS USM Extender 1.4x | $11,799.00 |
Canon EF 70-200mm f/2.8L USM Telephoto Zoom Lens for Canon SLR Cameras | $1,449.00 |
Canon EF 300mm f/4L IS USM Telephoto Lens for Canon SLR Cameras | $1,449.00 |
Canon EF 70-300mm f/4-5.6L IS USM UD Telephoto Zoom Lens for Canon EOS SLR Cameras | $1,599.00 |
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