Sigma 12-24 mm f/4.5-5.6 II DG HSM
7. Coma, astigmatism and bokeh
Similar things can be said in the case of astigmatism. Its level is perhaps not the lowest but the value of 9% shouldn’t worry us excessively.
The photos below show us the blurry images of a diode, positioned in different places of the frame. The effect of using only six diaphragm blades is distinct; also sharp concentric circles prove that the spherical aberration is not corrected completely well.
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