Nikon Nikkor AF-S DX 35 mm f/1.8G
7. Coma and astigmatism
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Another reason, apart from chromatic aberration, for evident reduction of image quality in the corners of the frame is coma. At maximum aperture the defect quite strongly deforms the diode picture. Fortunately, after stopping down by one aperture value the situation improves considerably.
Astigmatism, understood as the average difference between vertical and horizontal MTF values, amounted to 9%. It’s not trifling, but you don’t need to worry about it. Just a typical result in this price class, that won’t bother us much, but does have an impact on lowering the image quality.
