Canon EF-S 55-250 mm f/4-5.6 IS
7. Coma and astigmatism
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The coma correction was a nice surprise for us. The diode stays in its shape even in the corner of the frame at the whole focal length range. We can easily say that the level of coma is very little in this lens’s case.
Unfortunately, the lens suffers from a visible astigmatism problem, which reaches over 12%. This is a frequent characteristic for lenses that have too much plastic in their body build. So while pointing out interesting effects with the lens’s chromatic aberration and resolution we are not very surprised with this astigmatism problem.
