Nikon Nikkor AF-S 28 mm f/1.4E ED review - Coma, astigmatism and bokeh

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Nikon Nikkor AF-S 28 mm f/1.4E ED

7 July 2017

Arkadiusz Olech

7. Coma, astigmatism and bokeh

Photos below show clearly that coma and other higher rank aberrations connected to deformations of images of a diode are responsible for the worsening of image quality on the edge of the frame. A trace of coma is visible even in corners of APS-C/DX sensor and, unfortunately, even on stopping down the aperture to f/2.0. In corners of full frame that aberration level becomes significant and reacts weakly on stopping down as well. It is, next to the longitudinal chromatic aberration, the biggest slip-up, noted by us so far in the test.

Still it must be said that the Zeiss Otus 1.4/28 was not completely coma-free and the Nikkor AF-S 28 mm f/1.8G fared even worse.

Center, f/1.4	Corner APS-C, f/1.4	Corner FF, f/1.4

Center, f/2.0	Corner APS-C, f/2.0	Corner FF, f/2.0

When it comes to astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, we don’t have the slightest reservations. Its value amounted to 7.1% and we consider it moderate.

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Out-of-focus images are practically devoid of any distinct flaws. The light spread is more or less even, without any noticeable rims or local extremes. Still you can distinguish slight onion-ring bokeh, most probably connected to the presence of aspherical elements in the construction. We are a bit worried by distinct truncation of circles in the frame corners, indicating mechanical vignetting.

Center, f/1.4	Corner APS-C, f/1.4	Corner FF, f/1.4

Center, f/2.0	Corner APS-C, f/2.0	Corner FF, f/2.0

Center, f/2.8	Corner APS-C, f/2.8	Corner FF, f/2.8