Pentax smc FA 31 mm f/1.8 AL
7. Coma, astigmatism and bokeh
When it comes to the astigmatism the performance is much better. Its average value amounts to 6.5% so this aberration is not bothersome.
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Photos below show off focus point-like diode images. The spread of light is more or less even but, as you stop down, more and more distinct concentric borders appear, especially visible near the edge of the light circle.
