Sigma 70 mm f/2.8 EX DG Macro
5. Chromatic aberration
How the Sigma compares to other devices of this class? Unfortunately unfavourably. The aberration in the case of the Tamron 2.8/90 also decreased with the aperture but it was much faster; it became practically imperceptible already by f/5.6. The performance of the Sigma 2.8/105 was simply outstanding because the level of that aberration never exceeded 0.03% for the most commonly used aperture.
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