Nikon Nikkor Z 28 mm f/2.8 (SE) review - Coma, astigmatism and bokeh

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Nikon Nikkor Z 28 mm f/2.8 (SE)

1 February 2022

Maciej Latałło

7. Coma, astigmatism and bokeh

As long as you stick to the smaller APS-C/DX sensor coma shouldn't bother you at all. The situation changes when you start looking at corners of full frame. In that place off-axis aberrations of higher degree deform noticeably point-like images of a diode at the maximum relative aperture but you can't say the level of deformations is very high. What's more, on stopping down the aperture by 1EV the situation improves, and coma is being reduced quite significantly.

Taking into account physical dimensions of the tested lens and its price, you really shouldn't complain in this category.

Biorąc pod uwagę rozmiary testowanego obiektywu i jego cenę, na zachowanie w tej kategorii trudno poważnie narzekać.

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

Center, f/4.0	Corner APS-C, f/4.0	Corner FF, f/4.0

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 5.8%. It's a value that can be described as low so here the Nikkor performs even better than in the case of coma.

Aspherical elements in the Nikkor's Z 2.8/28 construction don't make themselves felt almost at all. You have to take a really close look in order to notice very slight trace of onion-ring bokeh. Overall, defocused circles of light are really good for such parameters. Even mechanical vignetting is not a serious problem.

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

Center, f/4.0	Corner APS-C, f/4.0	Corner FF, f/4.0

Center, f/5.6	Corner APS-C, f/5.6	Corner FF, f/5.6