Near bottom of frame at horizontal center
The 14-24 is very crisp wide open at f/2.8, improving at f/4, shows its usually slight decline on contrast thereafter.
The 16-35 produces a slightly soft image at f/4 - f/8, but delivers nicely at f/11.
The 17-35 is hazy at f/2.8 as usual, but cleans up nicely at f/4 and makes a nice crisp image at f/5.6.
The 20/3.5 produces a somewhat low contrast image at f/4, then improves through f/8.
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