Canon EF 85 mm f/1.8 USM
7. Coma and astigmatism
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In the corners of the APS-C sensor the coma is corrected very well. In the case of full frame the results are worse, though. This aberration is relatively distinct there and even on stopping down the aperture by 1 EV you can’t eliminate it completely. We must admit, however, that the cheap Canon competing with the faster 1.4/85 models is not fighting a losing battle here– the other lenses have had some problems with coma in the corner of full frame as well.
In the previously tested specimen of the Canon EF 85 mm f/1.8 USM the astigmatism amounted to 6%. During the second testing session of this lens’s new specimen we got the result of 4.8% so a bit better.
