Sigma A 50 mm f/1.4 DG HSM review - Distortion

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Sigma A 50 mm f/1.4 DG HSM

17 April 2014

Arkadiusz Olech

6. Distortion

Classic 50 mm devices don’t usually have any serious distortion problems; still it’s worth comparing the tested Sigma to its rivals to see how it fares. The appropriate data are gathered in a chart below.

	Zeiss Otus 1.4/55	Voigtlander 1.4/58	Sigma A 1.4/50	Canon EF 1.4/50	Nikkor AF-S 1.4/58G
APS-C/DX	−0.19%	−0.30%	−0.01%	−0.49%	−0.52%
FF	−0.69%	−1.01%	–0.12%	–1.98%	−1.41%

Two things are clear: firstly, the distortion level of the Sigma is practically zero within the margin for error so the constructors corrected it in a perfect way; secondly the Sigma result is the best of all 50 mm devices despite the fact that its task was a bit more difficult than that of the Zeiss and the Nikkor, as both of them feature a bit bigger focal lengths and are more expensive.

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