EXCERPT page containing first few paragraphs. 2021-04-11 18:24:51
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Sony’s MTF charts are what is fairly termed “fantasy” MTF, meaning that the charts are computed and do not take diffraction into account. Hence they CANNOT be compared to Zeiss MTF charts, which are measured results from real lenses.
Still, we can learn something from the charts.
The main thing seen is high central sharpness with a drop-off to the edges and corners. This drop-off could be lower performance, or it could be field curvature—the Red Barn example and Redwood Stump example suggest (very persuasively) that the drop-off is field curvature. In other words, the sharpness is even better (in a curve) than the MTF chart would otherwise suggest.
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