Nikon Nikkor AF-S 70-200 mm f/2.8G ED VR II
7. Coma and astigmatism
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The Nikkor-AF-S 70–200 mm f/2.8G ED VR II corrects the coma in the corner of the DX sensor very well – it is practically imperceptible there. Its influence is visible in the corner of full frame though, but still the level of this aberration is not high.
The astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 8% which is a good but not very good or outstanding result. You can notice a distinct tendency when it comes to this aberration. Its level is the highest at 70 mm, where it contributes significantly to the decrease of resolution, and the lowest or, in fact, negligible in the 135-200 mm focal range.
