Sigma 150-500 mm f/5.0-6.3 APO DG OS HSM
7. Coma and astigmatism
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As you see from the crops below, the correction of coma is very good. The picture of the diode is only slightly distorted, if at all.
The same can be said in the case of astigmatism, which average level was just 5%. You should notice, though, that it changes with the focal lengths and its highest value, of almost 10%, reaches at 500 mm, where it starts deteriorating picture quality a bit.
