Nikon Nikkor AF-S 70-200 mm f/4.0G ED VR review - Coma, astigmatism and bokeh

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Nikon Nikkor AF-S 70-200 mm f/4.0G ED VR

4 May 2013

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The lens should be praised for its coma correction. In the corner of the DX sensor that aberration is imperceptible. The image of a diode put in that place doesn’t differ from the image you get in the frame centre. In the corner of full frame the coma makes itself felt a bit at the shortest focal length - you can see a slight deformation of the light point, which tends to look more like a comma. That effect is not very distinct, though, and it cannot change a very positive assessment of the lens in this category.

Nikon Nikkor AF-S 70-200 mm f/4.0G ED VR - Coma, astigmatism and bokeh

When it comes to the astigmatism you can be as pleased as in the case of the coma, maybe even a bit more. The average difference between horizontal and vertical MTF50 function values amounted to just 2.3% which is an excellent result. The fact that the worst result possible for all combinations of apertures and focal length amounted to 4.8% is the proof that the lens corrects the astigmatism very well, performing evenly across the range.

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When it comes to defocused images they should be perceived as easy on the eye – the appearance of circles, created by defocusing light points proves it. The light spread in those circles is very even, without any significant extremes.