Nikon Nikkor AF-S 85 mm f/1.8G review - Coma, astigmatism and bokeh

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Nikon Nikkor AF-S 85 mm f/1.8G

10 March 2012

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The coma is corrected very well - in the corner of the APS-C/DX sensor its influence on the image of a diode is imperceptible. In the full frame corner the diode is slightly distorted but the effect is insignificant and, what’s interesting, less pronounced than in the case of a more expensive AF-S 85 mm f/1.4G.

Nikon Nikkor AF-S 85 mm f/1.8G - Coma, astigmatism and bokeh

It would be difficult to have any reservations concerning the astigmatism correction. An average difference between horizontal and vertical MTF50 function values amounted to just 2.9%. It is a result, within margin of error, exactly the same as in the case of the tested lens’s faster brother.

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A defocused images of light points from this lens are very nice, featuring even light distribution. What’s more, after stopping down the lens by 1-2 EV the images in the frame centre don’t differ from those reached in the corners of both the small and big detector. The lens definitely deserves to be praised here.