EXCERPT page containing first few paragraphs. 2019-09-16 14:35:34
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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 very good sharpness wide open over the central 3/4 of the field, followed by a drop-off to the edges and corners. This drop-off could be lower performance, or it could be field curvature. In other words, it might be better (in a curved field) than indicated.
The results at f/8 are of course fantasy to not take diffraction into account, but the chart suggests that a level curve approaching 80% for 40 lp/mm is likely, which is outstanding. Astigmatism is at very low levels; one might expect pleasing bokeh under most circumstances, at least in terms of the optics not adding anything unpleasant.
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Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.
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