Top left corner
Corner results are always suspect in the sense that field curvature can make any lens look bad. With real-world 3D shots, the field curvature can help or hinder. Yet sometimes the corners are just weak in general; it can be difficult to be sure without extensive field shooting, or good quality MTF charts to provide hints (not available in this case).
- At f/2.8, all the lenses except the 14-24 show a smeared look, the latter showing good detail.
- At f/4, all the lenses improve nicely, but remarkably, the 16-35 is nearly the match of the 14-24.
- At f/5.6, the 14-24 and 16-35 are performing well, with the 24-70 close behind, but the 17-35 showing some weakness at upper left. The 24/2 remains blurred.
- At f/8 the 16-35 and 17-35 show a bit better contrast than the 14-24 and 24-70. The 24/2 still lags.
- At f/11, all the lenses are producing similar results.
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