LensTip.com

Lens review

Sigma 150-500 mm f/5.0-6.3 APO DG OS HSM

16 July 2009
Arkadiusz Olech

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.

Sigma 150-500 mm f/5.0-6.3 APO DG OS HSM - Coma and astigmatism

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.