Nikon Nikkor AF 20 mm f/2.8D
7. Coma and astigmatism
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The coma correction level is also not as good as we would wish it to be. At the maximum relative aperture it is noticeable and it doesn’t disappear even on stopping down the aperture to f/4.0.
The situation is much better when it comes to the astigmatism. Here the difference between vertical and horizontal MTF50 values in the frame centre reached just 3.7% which is a result befitting a quite expensive fixed-focal lens.
