Sigma 30 mm f/1.4 EX DC HSM
6. Distortion
For Sony A100, Pentax K10D and Nikon D200 the results are in perfect agreement. Every time we see a noticeable barrel distortion of values -2.10%, -2.12% and -2.13% respectively. The agreement is perfect as the measuring errors in the case of distortion usually equal 0.1%.
As we expected, Sigma on Canon 20D shows marginally lower distortion, as a measured by us result equals -1.91%. It’s no surprise that the result on E-3 is even smaller and equals -1.46%.
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In this category Sigma didn’t deserve much praise or reprimand. It’s worth to stress, though, that in a prime of this focal length, designed for small sensors, the level of this aberration should be smaller.
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