Carl Zeiss Touit 32 mm f/1.8 review - Coma, astigmatism and bokeh

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Carl Zeiss Touit 32 mm f/1.8

29 September 2013

Arkadiusz Olech

7. Coma, astigmatism and bokeh

We remember perfectly well that the Zeiss 1.8/32 had serious problems with reaching a decent image quality on the edge of the frame near the maximum relative aperture. One glance at the crops below and you are sure that the coma is responsible to a great extent because its level is very high at the maximum relative aperture. Even on stopping down to f/2.5 that off-axis aberration is still keenly felt – it’s obvious the Zeiss doesn’t manage it well.

Carl Zeiss Touit 32 mm f/1.8 - Coma, astigmatism and bokeh

The astigmatism for a change is corrected very well. The average difference between horizontal and vertical MTF50 function values amounted to just 3%.

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The circles created by defocused light points look very nice as well - apart from the aforementioned lighter edges we don’t have any reservations. The light spread is even, there is no onion rings structure or any significant local extremes visible – as a result the blur, provided by the tested lens should be pleasant to the eye.

A noticeable change of the shape of the circles in the frame corners is another matter but it is a result of vignetting which is going to be described properly in the next chapter.