Samsung NX 16 mm f/2.4 review - Coma, astigmatism and bokeh

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Samsung NX 16 mm f/2.4

5 March 2012

Arkadiusz Olech

7. Coma, astigmatism and bokeh

As you can notice in crops, shown below, at the maximum aperture the coma is very high and it influences significantly the image quality decrease of the edge of the frame. Fortunately on stopping down by 1 EV that aberration diminishes a lot.

Samsung NX 16 mm f/2.4 - Coma, astigmatism and bokeh

The astigmatism in the tested lens is negligible. An average difference between horizontal and vertical MTF50 function values amounted to just 2% which is an excellent result.

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The photos below show a defocused image of a diode, positioned in the frame centre and in the corner. You can notice that in the frame corners the light is distributed very unevenly and it might suggest not very nice fuzzy areas.