Nikon Nikkor AF-S 200 mm f/2G ED VRII review - Coma, astigmatism and bokeh

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Nikon Nikkor AF-S 200 mm f/2G ED VRII

30 November 2011

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The coma is corrected in a very good way. On the smaller sensor its influence is practically invisible. In the corners of full frame, at the maximum relative aperture, you can notice only a very slight deformation of the circular image of the diode - it would be really difficult to complain about that.

Nikon Nikkor AF-S 200 mm f/2G ED VRII - Coma, astigmatism and bokeh

The similar performance we get in the case of astigmatism. The average value between horizontal and vertical MTF50 function values amounted to just 2.6% which is a negligible result and also one worth our decisive praise.

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Below we present some photos of out-of-focus point-like diode image, positioned in the frame centre, in the corner of the DX sensor and full frame. They can be used in assessing the blur and also get you an idea how the spherical aberration is corrected. The fact that the light distribution within those circles is almost perfectly even can prove that last aberration is corrected very well.