Carl Zeiss Touit M 50 mm f/2.8
7. Coma, astigmatism and bokeh
When it comes to the astigmatism the situation is similar. An average difference between horizontal and vertical MTF50 function values amounted to just 1.9% - a very low result.
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The appearance of defocused light points is nothing to be admired, though. There is a lot of slight unevenness and the beginnings of ‘onion ring’ bokeh. Apart from that you can notice that the lens has a lot of vignetting-related problems because even on stopping down to f/5.6 the circle in the frame corner is noticeably truncated.
