Nikon Nikkor AF-S 28 mm f/1.8G review - Coma, astigmatism and bokeh

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Nikon Nikkor AF-S 28 mm f/1.8G

31 August 2012

Arkadiusz Olech

7. Coma, astigmatism and bokeh

As long as you work on the smaller APS-C/DX sensor the coma shouldn’t be troublesome almost at all. The corners of full frame – that’s another story. The coma is really high there and it keeps a significantly high level even on stopping down by 1 EV. It can be noticed very well in crops taken from the photos of a diode.

Nikon Nikkor AF-S 28 mm f/1.8G - Coma, astigmatism and bokeh

A much better situation can be observed in the case of the astigmatism. The average difference between vertical and horizontal MTF50 function values amounted to just 2.6% which we consider a very low value.

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We don’t have any reservations about how the off focus images look. The circles we got by defocusing images of a diode show a quite even spread of light without any distinct concentric rings.