Sony Carl Zeiss Planar T* 85 mm f/1.4
7. Coma and astigmatism
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A slight coma letting know about itself by the image distortion of a diode situated in the corner of the frame, is remarkable. It is a very difficult problem to avoid in such light lenses. Its total elimination is unsuccessful in almost all light primes. In this category the Zeiss results are very similar to the results of the Canon 85-s and Nikkor.
As far as Astigmatism is concerned, Zeiss has a clearly visible problem in the vicinity of wide-open aperture. Here this fault reaching the level of 13% is mainly responsible for the deterioration of the quality of image. Nikkor 1.8/85 and Canon 1.8/85 noted much better results here – adequately 5% and 6%.
