Nikon Nikkor Z 135 mm f/1.8 S Plena review - Coma, astigmatism and bokeh

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Nikon Nikkor Z 135 mm f/1.8 S Plena

2 May 2025

Maciej Latałło

7. Coma, astigmatism and bokeh

The following crops show very clearly that the Nikkor Z 135 mm f/1.8 S Plena corrects coma in a good way. In the corners of the APS-C/DX sensor the image of a diode looks identical as in the frame centre and in the corner of the full frame detector it is just slightly deformed.

Center, f/1.8	Corner APS-C/DX, f/1.8	Corner FF, f/1.8

Center, f/2.5	Corner APS-C/DX, f/2.5	Corner FF, f/2.5

In order to present a comprehensive situation in this testing category we also decided to show crops taken from photos of the sky from the upper right-hand corner of full frame. This time we show shots by f/1.8, f/2.5, and f/3.5. In this case coma correction looks a bit weaker than in our diode test. It's pretty obvious that only after stopping down the aperture to f/3.5 the shape of stars is devoid of any deformations.

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Corner FF, f/1.8	Corner FF, f/2.5	Corner FF, f/3.5

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounts to 12.8%. It is an average value but we should mention the fact that this aberration remains visible only and solely by f/1.8 and f/2.0. By f/2.8 it decreases to an almost zero level.

In their declarations the producers wrote a lot about beautiful out-of-focus images generated by the Nikkor 1.8/135. The crops, shown below, and our sample shots prove that these declarations weren't unmerited. The circles of light look very nice, with a very even light spread, without any local extreme points or rims. What's more, mechanical vignetting is also controlled very well – a slight truncation of the circle in the frame corner is visible only at the maximum relative aperture and it disappears completely already on stopping down the aperture by 1 EV. A round of applause!

Center, f/1.8	Corner APS-C/DX, f/1.8	Corner FF, f/1.8

Center, f/2.5	Corner APS-C/DX, f/2.5	Corner FF, f/2.5

Center, f/3.5	Corner APS-C/DX, f/3.5	Corner FF, f/3.5