Studio Tests (APS-C, with 1.4x Extender in place)
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.|
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