SLR Magic 8mm vs LUMIX 7-14mm Lens Review
Lens Review SLR Magic 8mm vs Panasonic Lumix 7-14mm
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SLR Magic 8mm left, Panasonic 7-14mm (at 8mm) right, both f16-- center of image
You can see that diffraction degrades both lenses at f16, and this aperture should be used only when the image requires it.
Now let's look at the edges.