All of the lenses need f/8 here.
- At f/2.8, the 17-35 and 28-70 and 28/2 are all badly smeared. The 24-70 is quite goood, but with some smearing at upper right.
- At f/4, the 16-35 takes the lead, with only some slight softness at upper andn overall low contrast. The 17-35 still look terrible. The 24-70 is looking very nice but still with some softness at upper right. The 28-70 has improved greatly from f/2.8, but is still soft. The 28/2 remains smeared.
- At f/5.6, the 16-35 and 24-70 are looking great with the 28-70 very close. The 17-35 is still smeared and the 28/2 is starting to look reasonable.
- At f/8, peak performance is reached for all lenses. The 16-35 looks excellent, the 17-35 remains soft, the 24-70 and 28-70 look excellent, the 28/2 is very close.
- At f/11, there is nothing to be gained, though the 17-35 might be beneffiting slightly.
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