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EXCERPT page containing first few paragraphs. 2022-05-22 04:20:33

Sony / Zeiss FE 55mm f/1.8 ZA Sonnar

MTF for Sony FE 55mm f/1.8 ZA Sonnar

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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MTF for Sony / Zeiss FE 55mm f/1.8 ZA Sonnar

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