Sony 50 mm f/2.8 Macro
7. Coma and astigmatism
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The coma is corrected very well as you might find out glancing at the picture below. The diode image in the frame corner doesn’t differ much from the image of the same diode in the frame centre. You can still notice some slight influence of this aberration but it shouldn’t be a reason to complain.
The same can be said in the case of the astigmatism. The average difference between vertical and horizontal MTF50 function values in this case amounted to 7%. The 5% level of perfection was exceeded a bit but the difference is again so small that we shouldn’t carp about it at all.
