Nikon Nikkor AF-S 18-35 mm f/3.5-4.5G ED review - Coma, astigmatism and bokeh

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Nikon Nikkor AF-S 18-35 mm f/3.5-4.5G ED

10 December 2013

Arkadiusz Olech

7. Coma, astigmatism and bokeh

As long as you work on the APS-C/DX sensor, the coma won’t be a problem at all. Only after employing the full frame its influence becomes noticeable. The highest level of that aberration can be seen in the middle of the focal lengths range; still even there that value cannot be described as high or very high. In this category we have no serious reservations.

Nikon Nikkor AF-S 18-35 mm f/3.5-4.5G ED - Coma, astigmatism and bokeh

The astigmatism is corrected very well because the average difference between horizontal and vertical MTF50 function values amounted to just 3.7%. By the way we also noticed a slight difference between the maximum focal length, where the influence of the astigmatism on images is the most pronounced, and other focal lengths, where it is just negligible.

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Defocused light points don’t look nice. First of all you can notice distinct, concentric rings. Additionally the fact that there are only seven (and working rather unevenly to boot) diaphragm blades makes itself felt – after stopping down the rings are not especially symmetric. However, you should praise the weak influence of geometric vignetting on the shape of images in the frame corner.