Samyang 14 mm f/2.8 IF ED MC Aspherical
7. Coma and astigmatism
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As for a lens of such a large angle of view and f/2.8 light-gathering power, coma is well-corrected. On a small sensor it will be hard for us to see it. On a full frame it’s more noticeable, but its level is medium at most. The only thing that will bother us is a weak reaction to stopping down. The distortions of a diode image are not much different whether we use f/2.8 or f/4.0.
Astigmatism will give us some more reasons to complain. The measured level of this aberration reached 10%, so a noticeable, but not a large value. Fortunately, with this aberration, unlike with coma, stopping down helps reasonably.
