Carl Zeiss Otus 85 mm f/1.4 review - Coma, astigmatism and bokeh

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Carl Zeiss Otus 85 mm f/1.4

13 October 2014

Arkadiusz Olech

7. Coma, astigmatism and bokeh

We don’t have any reservations concerning the coma correction in the corners of the APS-C sensor. The corners of full frame are another story- the influence of the coma is noticeable both at the maximum relative aperture and by f/2.0. Its level cannot be called high anywhere but it’s worth mentioning that the aberration contributes slightly to the worsening of the image quality on the edge of the full frame sensor.

Carl Zeiss Otus 85 mm f/1.4 - Coma, astigmatism and bokeh

The astigmatism of the tested lens is slight – the average difference between horizontal and vertical MTF50 function values amounted to just 5%.

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Defocused light points look very nice, with an even, smooth light spread which means the lens will provide great blurred background. You can notice a trace of ‘onion rings’ bokeh but, fortunately, that effect is not distinct. The significant truncation of the rings in the corners worry us a bit – it might indicate some vignetting problems.