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Lens review

Sigma 300 mm f/2.8 EX DG HSM APO

29 January 2010
Szymon Starczewski

7. Coma and astigmatism


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Coma is often one of the most problematic issues for fast lenses. The Sigma is undoubtedly fast so we were curious how it will perform in this category. We were very pleasantly surprised because the coma is corrected well and the diode image in the frame corner is just slightly deformed.

Sigma 300 mm f/2.8 EX DG HSM APO - Coma and astigmatism

Unfortunately the astigmatism doesn’t deserve the same praise as the coma. The average difference between horizontal and vertical MTF50 values amounted to 10.2% which is a medium result.